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Pete C.

wrote:

I have restored function to computers by unplugging them from
electricity and unplugging and re plugging every connector in the
computer. Doing the unplug/re plug routine gives all the connectors a
new fresh connection. Corroded memory board contacts will keep the
computer from booting.

^ This. Whenever strange issues start to crop up with a machine that's
fairly old, powering it down and unplugging/replugging every connector a
few times wipes oxide buildup off the contacts and usually solves the
problem.