[altis]

I vote for the PSU too!

These days it's the first thing I change if I am seeing random probs. And I usually keep a spare one on the shelf - just in case. PSUs contain some highly stressed components and are often designed down to a price so, in the end, reliability gives. I remember once going back to a place that I'd worked before. They'd started using PCs as part of the product and in the corner of the test area was a pile of PSUs about 4 feet high - all dodgy ones that had been replaced!