Power supply. I had a system which would randomly fall over with no apparent cause. I replaced the RAM, video and network cards, motherboard and CPU but nothing changed. Then one day, it wouldn't power up so I replaced the power supply and it's run perfectly ever since.
This is the first thing I changed. I went out and bought a 320W PSU. It ran without a freeze for a few days but then it started the daily freezes again.
Best regards, Gonzalo
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