PC will not work in the case

[Bromford]

I have been trying to solve this riddle for a long time, (months).
My PC randomly shuts down when installed in the case. Even if some parts are in the case and others not, it still shuts down.
I have been using it for weeks now and it is perfectly stable, that's because it is a naked PC, all components assembled on a board on a shelf above my desk, I have tried to find a solution, I've researched this heavily and tried every trick I can discover, it's been in and out of the case a dozen times. I do not have parts to substitute so that makes it a tad difficult.
If anyone has any experience of this I am desperate for a solution.

AMD Athlon 5600+ 64x2
M2N32-SLI Deluxe
Inno3D GF8600GTS
WD 150G Raptor SATA
Seagate 200Gb barracuda SATA
2x2GB Patriot PC2-6400 800mhz
Generic 550watt PSU
Akasa Case

Brom

[wonderlust]

What temperatures does it get to in the case?

[Bromford]

Hi wonderlust

Temperature was one thing I considered, I did lots of temp tests as best I could and did not see anything too high.
But I discounted that as the cause because it was common for me to have to boot the PC several times within a few minutes when booting from cold before it would stay on, but it gradually became unusable in the case.
From when this started the shutdowns slowly increased in frequency, I began to suspect the £25 PSU, but as I said it's been running for weeks with no problem out of the case, so how can that be.
When using FS9 (out of case), it very occasionally will reboot after a couple or more hours flying, but it's rare, I know that is heat related and have applied a big fan, that stopped it. But it does not shutdown.

Brom

[jonwoad]

TBH I'd get a more expensive branded PSU, they are a ticking bomb in reality.

[mac124]

i had something similar a while back, pc would randomly power down / up, it turned out to be a dodgy power switch

[wonderlust]

you could always use your Reset switch as a power switch to test out Mac's idea. (don't connect the power switch to the reset, if it is faulty you will get the same issue.)

[Bromford]

Sorry for the delay in coming back to the points you all raise, had to pop out for a while.

Jon I think you're right I do need to spend on a good PSU, I'll never know if my existing one is guilty unless I do.

Mac and wonderlust regarding the power switch, I did suspect the switch so I disconnected all the front switch connections and booted the PC by shorting the Mobo contacts, it made no difference, problem was still there so I presumed the power switch was not the cause.

Brom

[brendy]

Are you using the proper riser points, screws and washer rings for the screws? it could be shorting out enough to reset but not enough to kill it.