I can't think of anything Mobo wise that'd make it shut down, usually if the mobo finds something it doesn't like it'll scream at you (series of beeps) that corrospond to which component it's have a bitch over. Full-on shutting down suggests to me a safety tripping in to PS, the fact there was no noises (such as the CPU fan whiring up) increases the chances of that. Unless the heatsink has completely fallen off or something it can't be overheating, if it was it wouldn't stay on anyway.
Most powersupplies are utter pieces of overrated shit made for around $3-4USD (trust me, I worked for an importer), my money is very much on that.
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Good friends, good books and a sleepy conscience: this is the ideal life.
- Twain
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