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New buil weird boot problem

Last response: in Systems
August 17, 2013 6:06:27 AM

Hi, I have a problem with a friend's new build and I'd like to explain to you all what's going on hoping that someone could help us.

At first we carefully put all the components together, including the old PSU my friend recycled from his previous build but like this the pc wouldn't even turn on.
(no PSU fan,cpu fan or whatever, only mobo and gpu leds turned on)

Then it turned out that the PSU was not compatible with his processor wich is a haswell i5 4670k, so he ordered a new PSU ( corsair tx 650 ) chosing it from corsair's compatibility list with haswell sockets.

At this point we tried to post it like a test bench with only cpu ( with heatsink mounted ) and 1 stick of RAM plugged in. It appeared to be posting because with this new PSU the cpu fan started to spin. So we decided to mount the mobo into the case, but at the end of the build we got nothing. The same problem popped up again, no PSU fan, no cpu fan, only mobo and gpu led turned on.

We decided to disassembly the build and then we went away for 2 days.
The mobo sit with only cpu and ram plugged in for theese 2 days and the 3rd day my friend tried again to boot it up like a test bench like that and it booted.
So he decided to plug in the gpu and see what was going on, it turned out to be actually posting. He mounted the mobo again onto the case and when tried to boot it up the probem popped up again :fou: 

At this point I would like what the comunity of TH thinks about this episode, and I'd like to explain what I think could be causing this problem.

This case has a mounting method which does'nt include the classic atx mounting screws ( in fact they're not even provided with the case).
It just has some sort of knobs on wich you directly screw the mobo to, but they're not like made of plastic, they actually are part of the metal body of the case coming out to isolate the modo from the side. Could this be the cause of the problem?
Could it be causing some kind of short preventing the buiild to boot up?


Best solution

August 17, 2013 6:11:55 AM

maybe there is metal part of the case touching your mobo from the back
just my $0,02
August 17, 2013 6:22:04 AM

AMD Radeon said:
maybe there is metal part of the case touching your mobo from the back
just my $0,02

Thanks, i'll try to get some atx mounting screws, but I'm not completely sure that's the problem.
August 17, 2013 11:22:41 AM

Anyway, as I said earlier, the case has a system which doesn't imply atx mounting screws to attach the mobo to the case.
If I put some screws in there the mobo would be too high to fit in the I/O shield ....
I'll try something else but I'd like to hear some other opinions