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#11
I've been building my own PC's since around 1990!
I use a 'regular' 1/2 inch household (wall/door) painting brush to clean fans/motherboard/ram/chipsets/cards.
Never killed anything yet!
Have you got a loose power connection? Is your power cord pushed tight into power supply/wall socket?
Starting your PC up and it gets hot/then cold causes chip/wire socket creep.
Make sure bios chip is pushed all the way in, go around each socket where wires connect inc main motherboard 20pin, wiggle them and push all the wires in to ensure proper connection!
Power supply could be giving out if you get the weird (non)start up's then fail or a leaking capacitor on your motherboard.
Use magnifying glass to check no capacitors on M/B have burst/are bursting their caps/tops.