Thanks for all the suggestions. No smell or sign of coolant leaks. The machine has a Sonnet SATA add on hard drive expansion bay for up to three more drives. I had two additional drives installed. I have copied the files and removed one of the drives and the computer has not shut down since. The original owner used the box as a server and told me the power supply could not support five drives (failed to startup), maybe it can't support four now?
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