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New PC build. Is the MoBo broken? Power switch? or did I miss something..

post #1 of 9
Thread Starter 
Hey guys, need some urgent help.
I'm building a computer for my father and after putting it all together, followed by the moment of suspense where you reach down to press the power button for the first time, the system did nothing.

MoBo being installed:
Gigabyte GA-B75M-D3H
PSU:
Antec 450W (this is the PSU from his previous build I installed 1-2 years ago. It was still working when his comp died)

This isn't my first time building a PC, but I'm still an amateur, and I'm truly stumped here. I tried with just the 24 pin and 8 pin power connectors, along with the power switch and LED's to no avail. Then I tried with my computer's PSU (550W Antec Tru-Power).
The first time I pressed the power button the LED's in the fan flashed on and the PSU fan spun for 1-2 seconds then stopped. The second time the fan LED didn't come on at all and I think the PSU fan spun for half a second. The third time nothing happened.
With my dad's PSU I'm assuming the same thing occurred with the fan; I couldn't see what it was doing since it was facing downwards (bottom of the case).

So I don't believe its anything to do with the PSU. I'm just hoping I've missed something. Bloody hoping the case power switch isn't faulty, or the MoBo isn't broken...
post #2 of 9
Have you tried jumping the motherboard power switch leads with a screwdriver or something of the sort?
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post #3 of 9
I have had this happen to me before and somehow I had shorted something out putting in the back plate. because when i pulled m/b and put back in it went in the plate easier and screw down easier did not have to push it to get screws to line up. and then it fired right up!!!
post #4 of 9
heres a good way to test to see if your dad's motherboard is fried. leave the 4 or 8 pin power connector and 24 or 20 power connector attatched to the board and pull the ram sticks off the motherboard, then try to jumper the power switch connectors on the mainboard. if the thing doesn't even emit a slow beep for the lack of ram then the board is probably fried. make sure before you do this you have everything grounded right.
 
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post #5 of 9

I assume you installed the standoffs?

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post #6 of 9
Thread Starter 
Crap! I didn't install the standoffs. Could that mean I fried the motherboard then in my attempts to power it on with it short circuiting and all?
post #7 of 9
yes it could. best bet would be to take it back and play dumb and hopefully they replace the board.
 
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post #8 of 9
If you arent using standoff screws, make sure the metal leads on the back of the board arent touching the case. That can cause it to not post. I would try that first before bringing it back, but if they will take it back I would totally do that.
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post #9 of 9

You might have killed it, but mobos can shut themselves off before damage occurs in the event of a short circuit. Pull the board, install the standoffs, and retry! 

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