Hardware Analysis Community Forums http://www.hardwareanalysis.com/content/topic/6793/ 2008-10-08T04:52:25-05:00 http://www.hardwareanalysis.com/content/topic/6793/ http://media.hardwareanalysis.com/halogo.gif text/html 2008-04-21T23:48:10-05:00 Donnie Tittle http://www.hardwareanalysis.com/content/topic/6793/?l=1#534151 I have a issue i am looking for more input on i built a PC around a Year ago and all was good for about 4 months then i had trouble with my mouse and my Kayboard going out i would then hit the reset switch and reboot my PC with everything working fine THEN one day my mouse and kayboard went out so i hit the reset switch as normal and nothing happend no boot screen nothing so i thought it might be my mobo so i got a newone (exact same Mobo) and replaced it and same thing all lights are on all fans kick on CDROM powers up Hard drive seems to be powered there is nothing wrong with my video card yet i get nothing on the screen NO boot screen bios post screen NOTHING if anyone has any ideas i have allmost replaced the whole PC minus the HD and tower is it possible this is a Power (or lack there of) issue ???? text/html 2008-03-09T16:19:20-05:00 Art Bianconi http://www.hardwareanalysis.com/content/topic/6793/?l=1#531022 This problem has happened a lot with all my electronic devices including my TIVO, my television sets and monitors. In the final analysis, the problems were all caused by a build up of dust and carbon soot caused by a malfunctioning oil fired furnace. <br /> <br /> It was compounded by a poorly fitted flu pipe to the chimney stack and by leaks around the combustion chamber. The last two problems were created by the furnace repairman!<br /> <br /> In every instance, the problem was solved by removing access covers and using compressed air to purge the accumulated soot from within the device.<br /> <br /> Soot is carbon in fine particulate form. That's the same material used to make resistors. As the accumulated soot builds up between live circuits, it eventually forms a low resistance short. Now a direct short that causes burned circuits, but rather a resistive short that drains needed voltage from a circuit either to ground or to an adjacent circuit on the board. The low voltage circuits common to today's electronic devices, do not have surplus voltage to tolerate this condition and while the short does not normally damage anything as in high amperage short circuits, it does drop the voltage across sensitive circuits to a value where the machine ceases to function.<br /> <br /> Another trick is to merely pop the small BIOS battery, that disk type, nickle sized one on the motherboard and let the PC simply sit there for a few minutes. <br /> <br /> I am not sure why removing and reinstalling that battery should make a difference but it often does.<br /> <br /> text/html 2006-09-29T15:26:03-05:00 Randy Tejada http://www.hardwareanalysis.com/content/topic/6793/?l=1#448613 I came back from a trip and one of my computers wont turn on. They we're both turned off before i left. I tried several time to turn in on but nothing. No fans, sound anything except the little green light on the Motheboard. I unplugged and re-plugged the power supply and i heard something like small little spark noises. I smelled the unit around the fan area and it smelled a little burned. So i went ahead a bought a new Power Supply thinking it would solve the problem. When i installed it nothing would turn on, just the little green light?<br /> Anyone have any ideas? text/html 2006-08-27T16:43:36-05:00 Brendon Fredlund http://www.hardwareanalysis.com/content/topic/6793/?l=1#441371 I changed the PSU and everything works fine. If you are still having problems, get a larger PSU and see if that fixes the problem. It seems like the most common problem. text/html 2006-08-17T20:09:06-05:00 Klay Abele http://www.hardwareanalysis.com/content/topic/6793/?l=1#439464 Hey, i found out wat the code on my MOBO meant, it read &quot; F.3. &quot; and when i looked it up it said 'Power Supply Sequence Error' so i'm pretty sure I have to RMA my power supply. text/html 2006-08-16T20:37:17-05:00 Brendon Fredlund http://www.hardwareanalysis.com/content/topic/6793/?l=1#439151 I also went on a trip and when I returned, my computer would not turn on! Our house sitter said the PC wouldn't turn on for her either, though. There are no noises or anything when I press the power button, just silence. I am going to take a multimeter home with me from work and test the power switch and the MOBO test points. After that, I'll use another PS to see if that is the problem. The strange thing is that a green power light comes on the MOBO when I plug the PC in, but the power button does nothing. It is like the power button just doesn't work or something. I'll keep you guys posted. text/html 2006-08-02T19:25:53-05:00 Klay Abele http://www.hardwareanalysis.com/content/topic/6793/?l=1#435944 Hey, I tried swapping power cords, Still having the same problem. I dont think its my power supply thats the problem. text/html 2006-08-02T18:15:36-05:00 Meats_Of_Evil http://www.hardwareanalysis.com/content/topic/6793/?l=1#435916 Try using another cord. It may seem stupid but it happened to me once and If I would've know early I could have saved 300$ from worthless hardware swaping. text/html 2006-08-02T17:55:51-05:00 Klay Abele http://www.hardwareanalysis.com/content/topic/6793/?l=1#435903 Hey, I recently came back from a trip and when i went to start my computer up (which the power strip it was on was off.) the button did not work. I took off the side panel to see if my mother board was getting power. The LED on the mobo was on, i reconnected the &quot;power sw&quot; cord, but no result.<br /> <br /> any idea's?<br /> <br /> -Klay Abele text/html 2006-06-23T20:31:30-05:00 jose silva http://www.hardwareanalysis.com/content/topic/6793/?l=1#424610 my problemis diferent nothing turn on ,and i even tried a different power supply. i need help. thank you text/html 2006-06-09T10:14:26-05:00 Steffen Lewenhardt http://www.hardwareanalysis.com/content/topic/6793/?l=1#420239 Mike this is -exactly- the same problem I have! Could anyone shed more light on this?<br /> <br /> Usually over night I disconnect the entire PC &amp; monitor from the power supply. I have found that when I just keep everything connected over night, bootup attempts reduce to 1 to 3 &quot;bootup-please-button-pushes&quot; in the morning, then everything works fine.<br /> If I instead disconnect everything as usual, it now takes me up to 20 minutes of repeatedly begging it to boot up completely. This increased over the course of a couple of months.<br /> I have also found that switching the power supply on the back of the case on and off in between try´s seems to reduce the number of attempts a bit.<br /> <br /> Any idea´s ? text/html 2005-12-13T00:51:01-05:00 mike britt http://www.hardwareanalysis.com/content/topic/6793/?l=1#358503 ok what about this...<br /> <br /> naked setup, (psu, mobo, video)<br /> <br /> the fan spins and then everything shuts off... except an LED on the mobo<br /> shut of switch on psu and the LED goes off.<br /> few seconds later, flip switch and the fan spins for 2x longer... everything goes off except LED<br /> shut of switch on psu and the LED goes off.<br /> few seconds later, flip switch and the fan spins for 2x longer... everything goes off except LED<br /> shut of switch on psu and the LED goes off.<br /> few seconds later, flip switch and the fan spins for 2x longer... everything goes off except LED<br /> shut of switch on psu and the LED goes off.<br /> few seconds later, flip switch and the fan spins for 2x longer... everything goes off except LED<br /> <br /> after twenty minutes of this the motherboard will finally STAY ON<br /> <br /> so then i plug back in the hard drive and it's ready to go<br /> <br /> -----------<br /> <br /> what is this all about? when the problem first happened it took ten minutes the next day it took half an hour now it takes me about an hour to boot up. - now i just flip the &quot;on&quot; switch and leave it alone for an hour then it's ok... do older computers need time to &quot;recharge&quot; or something?<br /> <br /> text/html 2005-06-09T07:06:04-05:00 Adam Long http://www.hardwareanalysis.com/content/topic/6793/?l=1#285339 I have a problem which sounds similar to what many of you describe. At first, I could just turn off the pc and then turn it on again and everything would boot normally. As time goes on, it has become more and more work to get my machine to post.<br /> <br /> Tired of the problem, I slapped a troubleshooting card into a pci slot and discovered that the 3volt standby power led was not showing any power. After a couple of resets, I start to see a light pulsing which then builds to solid green over the course of a few minutes. When the led is fully lit, I can turn off the computer, turn it on again, and watch it boot.<br /> <br /> My inclination, at this point, is to suspect the power supply. I'm also inclined to believe that some, or all, of you are assuming your machine started after changing the power cord. I can see no logic at all in this line of thought, and my little LED tells me otherwise.<br /> <br /> Anybody? text/html 2005-05-21T04:50:04-05:00 Eva Sutorowski http://www.hardwareanalysis.com/content/topic/6793/?l=1#278193 Hi everyone<br /> Just the other day we had a storm, lights still stayed on but all things plugged on the power points turned off, so the wires tripped. After turning the safety switch all was fine except the computer tower won't turn on. Should I change the power supply first or has anyone else got a different opinion. Please get back to me that would be much appreciated. thanks. text/html 2003-08-18T14:40:24-05:00 Bolda http://www.hardwareanalysis.com/content/topic/6793/?l=1#53877 this is a strange problem. my mobo and psu combo have had the same problem from time to time. sometimes when i reboot, my mobo will not run the pre boot test (memory test) and just sits there waiting. if i press the power button off then back on it is ok. tests mem and then detects ide drives. and boots. I have found that if i remove my usb cable modem and/or usb keyboard/mouse combo then this problem will never happen. i think that it has to do with the small standby current supplied by my psu. the serial ports use it, usb, video, ethernet (wake on lan). when i have all of these things configured to wake the pc from a power down state, this problem can sometimes happen. but i am a least getting power to the mobo. video bios boots and then it hangs at the mem test.<br /> sometimes if i disconnect the power cord from the back of pc, and put it back then boot, my cpu speed resets to the default speed of 500mHz, and i have to enter bios and then exit again to reenable 1gHz.<br /> this leads me to think that by disconecting the power cord that some static carge that has built up in the case may reset the bois.<br /> this same thing could be happening to you. you may have a bad earth connection in your house. the earth rod (mettal rod that is driven into the ground outside your house and connected to the earth circuit of the dommestic wiring of your house) may be in very dry ground. it needs some moisture to for a good circuit with the earth. ans so your psu may be building static that is inhiditing the on/of circuit from working. when you press the button on the case the standby voltage is connected to the earth circuit dropping it to 0volt, this signals the psu to power up. if the ground circuit is not working correctly then any static in the case can prevent the on/off circuit from dropping to 0V. disconnecting the power cord must discharge any static. tyr connecting a wire from a screw on the outside of the case to the plumbing (cold water pipes) and see if this helps. if it does then you may have to get an electrision to fix the earthing problem in your residence.