Case shorting mobo

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25 Aug 2011
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I've been given a machine to try and fix by a family friend that would not power on. If you push the power button nothing would happen at all. I tried a different PSU and tried to jumper the power switch with no joy, I also cleared the CMOS. I then attempted to build the machine out of the case and it started working again. After looking at the inside of the case I noticed this.


The board is a micro ATX and all the parts I've circled are mark for micro ATX. This is where it get interesting, there are only 3 mother board stands. These had been positioned in the 3 lower highlighted screw holes and the rest of the board had been screwed onto the mounds. I'm guessing this was causing the mobo to short and not boot. I guessing this case does not have the correct amount of stands and screwing it directly onto these mounds had caused a short?
 
some cases have mounds and no standoffs are needed

on the mounds are the holes threaded? if so they probably need standoffs screwed in aswell

but yeah it will short on the case if non were used
 
What model case is being used?

Some cases have pre-moulded standoffs and only come with a hand full of brass screw-in ones so you can use different sized boards.
 
I have seen the same thing on a couple of cheap cases in budget builds. I got around the problem by putting a piece of insulating tape over each mound then poking the hole through with something sharp. That way, when you screw the board down it can't short.
 
I have no idea what the case is there are no markings on it. Seems like a £10 special even when standing if feels like it could easily fall over.

Good idea about the insulation tape, I will give it a try.
 
Turns out it wasn't the case after all. When ever I connected the front USB headers the machine would fail to power on. There is no firewire on the board so that can't be responsible, at least its up and working now.
 
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