So I'm building a cheap system for a friend.

Motherboard: Intel DG45ID
Processor: Q8400
Memory: Adata DDR2 800 (2x2g)

In trying to solve this, I've replaced the processor and memory with known-good components from another PC. These known good components ARE on the compatibility list of the motherboard.

I hit the power button and everything powers up but monitor does not wake up. I try 2 known good power supplies (one 24 pin the other 20 pin) and they do not power up but for a fraction of a second and then shut off. I get to looking at what is the difference in my PSU's and realize that my original PSU is set on 230V. I change it to 115V and then it behaves exactly like the 2 known-good PSU's just powering the fans for an instant and going off.

There is no case short (it's assembled on antistatic bags on my floor now.)

Did I fry the mobo with the PSU set to 230V? And oh yea, this is the 2nd mobo that's behaved like this as I RMA'd the first without discovering the 230V switch.

5/20/2011 9:53:15 AM

First, your antistatic bags are meant to house things properly, not prevent static while things are placed on them. I would use the Mobo cardboard box when post testing outside the case.

Do you hear any post beeps? I would remove the ram and see if the board screams, to know if you fried the board or cpu.

5/20/2011 11:21:00 AM

ok it's in the box now...

and no, there were never any beeps... the spu fan and psu fan only flash on for a fraction of a second. Mobo light remains lit entire time.

5/20/2011 2:17:28 PM

check your pin-outs for power/reset/leds
check your seating of memory
check the seating of all the power plugs

try booting with cpu/motherboard/memory only, no peripherals, no hard drives.

5/20/2011 3:04:37 PM

I know a lot of boards come with a speaker, some don't. If you don't have a mobo speaker, you can get one for cheap, or bring it to a repair shop and ask to borrow one. If you have a micro center near you bring it there and they might help.

5/20/2011 10:44:38 PM

Quote :

"check your pin-outs for power/reset/leds check your seating of memory check the seating of all the power plugs try booting with cpu/motherboard/memory only, no peripherals, no hard drives."

Done and no change

Quote :

"I know a lot of boards come with a speaker, some don't. If you don't have a mobo speaker, you can get one for cheap, or bring it to a repair shop and ask to borrow one. If you have a micro center near you bring it there and they might help."

It has a built in speaker, but doesn't stay on long enough to beep.

I don't really understand how, but I'm pretty convinced that my trying to power it up with the PSU set to 230V has somehow damaged it.

5/21/2011 9:38:16 AM

You said that you tried to boot with different and known working memory, CPU, and PSU. The process of elemination says the problem is the motherboard.

Plugging a PSU set for 230V into a 110V socket is more likely to damage the PSU than the downstream components.

5/21/2011 10:20:58 AM

Quote :

"It has a built in speaker, but doesn't stay on long enough to beep."

That almost immediately suggests a power-related issue, and if you've tried multiple known-working PSU's, it's the motherboard.

Quote :

"The process of elimination says the problem is the motherboard."

5/21/2011 11:36:47 AM

what everyone else said

5/21/2011 7:29:10 PM