Computer boot issue

[Tim Burton]

I finished my dissertation paper last night and went to bed. Just before I fell asleep, I decided I better email a copy to myself. So I got out of bed and sent it. I woke up in the morning and boy was a I glad I did. The computer appeared to have suspended.

I pressed the keyboard and the backlight turned on. I then noticed that there were no fans running. I looked at it more and it seemed like the entire computer was off.

So I pressed the power button. Nothing.

I thought it was strange. I fiddled with it a bit and decided to turn off the pwer bar and the PSU and let it sit.

I came back and flipped the power bar and the PSU to on. Still nothing, the power button didn't turn the computer on.

I popped open the case and looked. The red LED light was on next to the PSU/MB plug (The big one that give power to the MB). I then looked at the BIOS boot code LED and that seemed fine.

I then reached in a pressed the MB power switch (This turns it on when you are tweaking the computer and it is next to the MB reset buttong) and nothing still happened.

I stood back up and looked at the computer and noticed that my Bluetooth USB key was getting power and the LED light was on. I tried turning off the power on the power bar and the BT light went out.

I was thinking I blew the PSU, except I am unsure because the MB power light (red LED light) that says the MB has a power connection to the PSU is on. So it seems at least some power is getting to the computer.

Suggestions?


Specs:

PSU: http://www.jdoqocy.com/click-3196663-10 ... 6817139002
Abit IP35 Pro
Q9450
MSI 8800GTS 512MB
4 Gigs of DDR2 A-DATA RAM
Vista 64-bit Ultimate

*Thank the Lord I sent a copy by email to myself. I was able to turn it in just fine.

[Skippman]

Is the PSU's fan spinning at all?

[Tim Burton]

No, nothing.

[Skippman]

The PSU is designed to give a signal to the powerboard (on the green wire) to allow the motherboard to control the power supply unit, that's whats giving you the red light. When the power up signal is sent it should trip the power supply's fan.

Try the paperclip trick of jumpering the green wire to a black wire on the ATX power connector. If the power supply doesn't spin up it's dead. If it does, you've blown part of the motherboard, likely the ATX header.

[DMB2000uk]

Make sure the power supply is unplugged from all the PC components when you try the paperclip trick.

Have you tried resetting the CMOS yet?

Dan

[martini161]

no, its ok to hook it up to fans, in fact thast probably better as running ha psu unloaded is bad

[Tim Burton]

Crap, I don't know if I want it to be the MB or the PSU. Actually, I'd rather it be the MB. I just sent the original one to be RMAed this was the replacement that was less than a week old.

If it is the MB, can I put in a new one of the same make and model and boot it up, or do I need to format it again? I'd rather not have to, I just finally got it set up just like I want it.

[Skippman]

If you're really lucky you can just swap it out.

[Tim Burton]

If you're really lucky you can just swap it out.

I know you can't if you change MB models, but I was wondering if it is the exact same model of MB. Is that still a factor of luck?

[martini161]

i went from a 680i mobo to a p45 without having to reformat

[Skippman]

It can be. Windows is a bit picky. Something to do with the actual versions of the various chips on the board. I've had systems where I used identical boards from the same shipment and the same vendor and Windows completely redetected everything. I don't know if it's got to do with the BIOS and how it manages plug in play or not.

[Tim Burton]

Paperclip test told me it is the MB.

Crap, I want cross shipping! I replaced my working (except two SATA ports) MB with a non-functioning one.

[Skippman]

Well, small condolance but at least now you know.

[DMB2000uk]

Just on the off chance that it is your PSU, next time it's plugged into everything, check the voltages with a DMM, to make sure they are in spec.

Dan

[kappage]

Ive got something similar here with an old mobo ive got. At the bottom of the board you can see a Huge burn mark that goes up the back of the board from were a cap blew up. It still works it just doesnt like turning on. IE unplugg PSU, wait 10mins, PLug PSU back in it turns on.

just thought id share

[Tim Burton]

Just on the off chance that it is your PSU, next time it's plugged into everything, check the voltages with a DMM, to make sure they are in spec.

Dan

DMM?

[Darkstar]

digital multi meter