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Computer random restarts
Basically I built in from scratch and it has run fine for a year at least. Then out of the blue the screen went black and it turned off about 3 seconds later.
It then turns on again and lasts about 5 seconds before shutting down.
The first time it happened it wouldn't start and just kept restarting, it was left overnight and still wouldn't start.
Got home from work early to bring it to the repair guys, and suprisingly it didn't shut off, it started fine. I brought it down to them and they couldn't find the problem and it run fine for them...
So got it home and it lasted a few days before it shut down and tried restarting. It seems to turn off and then after 3 attempts it gets started up again. Sometimes it runs fine for a few hours and sometimes a few mins.
I don't know where to start, the shut-offs are very random and I usually return home to find it has restarted while I was away.
Does anyone know what I should check/replace first, any help would be appreciated as this is getting very frustrating.