Computer shuts down right after being turned on

Hi, all!

I'm asking here because I couldn't get an answer after searching online.

The machine I'm running is listed below. I've had it for a few months, and today, when I tried turning it on, it would shut off within a second or two of turning it on. No POST, no nothing. I tried unplugging the PS, because I read online that that sometimes solves similar problems people were having, but no luck. Before anyone asks, I installed an HD 3850 a few weeks ago, and that's the only hardware change.

I think it could be the BIOS, but I've never had problems when I upgraded it when I built the machine.

Any suggestions would be great!

I just did some testing, and now I think the problem might be the PS. Unfortunately, I don't have one laying around to test with, so I'll have to wait until next paycheck.

bd..... if your name is dan imma crap myself LOL he's got i think the same computer and from IL

What motherboard are you using? Try clearing the bios out. Remove the battery, short the CMOS clear for a good minute or so, reinstall the battery, and try to power up. It could also be a PS problem. Try disconnecting the PS from EVERYTHING, short pins 4-6 together on you main MB connector and verify your voltages with a multimeter.

Oops, sorry about that, I didn't even see your sig. Try testing the PS the way I mentioned before. As long as pins 4 & 6 are shorted, it should remain on and output all voltages.

I'm having the exact same problem. I press the power button and it turns on just long enough for the fans to light up and spin around once (like half a second) and then shuts down. If I try that again it doesnt do anything until I unplug from PSU and then replug and hit the power button again.

So far I've inspected all the power cables, taken out all memory except one stick (need to check them all now that I think about it) and that's it.

I will try shorting pins 4 and 6 together on the PSU by itself to turn the PSU on but then what voltages am I looking for on the main connector? What pins should I check voltages on and what should those voltages be? I'm thinking if it even turns on that it will be good but would like to check voltages on it just to be sure it's going to work in future. Unfortunatley I have no other mobo and cpu to bench check with.

I took battery out of mobo and put back in after a minute. I didnt try to clear cmos. I will try that when I get a chance tonight.

I know things have been said already on this post but what else can I do to verify that it's the mobo that is fried or cpu?

I had this problem, I RMA'd the motherboard and the replacement fixed it.

I solved the flashing green led problem by swapping my screws to smaller screws to secure the motherboard.
The larger screws were touch the electronics on the asus motherboard.

Hey,

Remove the bold text, if you don't mind. You can create a thread by clicking the "Ask the Community" button on the top right of the site.

What are your system specs, it may help other people solve your issue. Have you read this sticky? If not then read it, it could be helpful.