power cycles every 3 sec

June 21, 2012 at 17:03:12
Specs: Windows Vista, 4mb
Power cycles every 3 sec, fan on power supply and video card starts and off again. Was in sleep mode when shut off.

See More: power cycles every 3 sec

Report •

June 21, 2012 at 17:25:04
What happens, when you first press and hold the power button for about lets say 10 seconds?
After that, power on normally.

Report •

June 22, 2012 at 10:52:07
when I press and hold, the computer will stop, then when I press to power on the thing will start power cycleing again. I think it is stuck in sleep mode, thats where I had it when this started.

Report •

June 22, 2012 at 19:52:14
" I think it is stuck in sleep mode "

The computer system CANNOT stay in "sleep" mode.

You can have problems with Windows not recovering from Standby or Hibernate modes, if you installed Windows from scratch and did NOT load the main chipset drivers for the mboard after Setup was finished, but in any case, if you hold the power button in or down until the computer shuts off, the system cannot be in "sleep" mode when you start up the computer again.
If the computer will not start up normally in that situation, something else is wrong.

If this is a desktop computer.......

The CPU fan must spin, and it must be connected to the correct 3 or 4 pin CPU
fan header, otherwise most mboards will shut off in a very short time to prevent the CPU from burning out.
However, the computer does NOT restart automatically when it does that.

Failing power supplies are common and can cause your symptoms.

If you can borrow a power supply from another working computer, try connecting that.

If you have a video card installed in a mboard slot....

Your power supply must have at least the minimum 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 ! )
If that info is not in the ad for the video 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 12 v 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. Some power supplies have two or more +12 v ratings - in that case, add those ratings to determine the total +12 v current capacity, OR, if the max total amperage or watts at +12 v is stated, go by that instead, whichever is less, (max watts at +12 v divided by 12 = the max amperage at 12 v).

An inadequate power supply may work at first, but it will be damaged eventually from it being constantly overloaded.

Report •

Related Solutions

June 22, 2012 at 21:32:02

hopefully you didn't get me wrong.
You have to press the power button for at least 4 seconds, so that the computer shuts off completely.

As Tubesandwires stated, even if the computer was in sleep mode, after holding the power button for 4 or more seconds, the computer ends the sleep mode and should start normally.

If it doesn't, there is another problem to solve.

Report •

June 24, 2012 at 14:48:02
Thanks everyone, it must be the pwr supply. I'll try that and get back to you..

Report •

Ask Question