Computer Shuts Down After 5 Seconds

System manufacturer / System product name
October 2, 2009 at 18:05:14
Specs: Microsoft Windows Vista Ultimate, 2.5 GHz / 4094 MB
After I turn on my computer and before I can even access the BIOS the computer shuts off. It shuts off as if someone pulled the power plug out of the wall. I can't even get into my BIOS before the PC loses power. I built this computer myself and I'm guessing that the powersupply is just no good anymore. I checked all power connections to the motherboard and everything is tight. This problem just suddenly started happening about 5 minutes ago. Before I buy a new powersupply I would really appreciate to hear your thoughts. Thanks!

Incarn


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#1
October 2, 2009 at 18:21:00
Check the CPU fan. If the CPU fan has stopped working that will cause an immediate shut down to prevent the CPU from overheating.

Stuart


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#2
October 2, 2009 at 18:23:44
The CPU fan starts up fine.

Incarn


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#3
October 2, 2009 at 19:16:42
Failing power supplies are common and can cause your symptoms.
Check your PS.
They often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
See response 4 in this:
http://www.computing.net/hardware/w...

If it is failing, you can usually replace it with any decent standard sized standard ATX PS with the same capacity or greater.

Standard (PS/2) power supply size - 86mm high, 150mm wide, 140mm deep, or 3 3/8" h x 5 7/8" w x 5 1/2" d , or very close to that, though the depth can be more or less for some PSs.

Don't buy an el-cheapo PS.
See response 3 in this:
http://www.computing.net/answers/ha...
.....

A frequent mistake people are making these days is they have installed a video card their power supply hasn't got enough capacity to support.

Your power supply must have at least the minumum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD!)
You can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements.

If the power supply does not have enough capacity, the video card often works fine at first anyway, but the PS is overloaded 100% of the time the computer is running and the PS is damaged and will eventually fail completely.


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#4
November 30, 2009 at 05:23:57
I'm sorry, I should have replied right away when I solved the issue. I ordered a new PSU from NewEgg and everything works like new! Thanks for the help.

Incarn


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