Optiplex 755 shuts down after waking it from sleep

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Optiplex 755 shuts down after waking it from sleep

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I have an OptiPlex 755 machine, Desktop model, that I recently got from work as a freebie. There was no hard drive, so I bought a WD 500GB 3.5” for it and I’m running Windows 7 Professional. Everything works great except after I wake it from sleep. It always just spontaneously shuts down a minute or two after waking it. I can work for an hour or two straight with no issue whatsoever. However, every single time I let it go to sleep and then awaken it, it shuts down within a minute or two.

Anyone have any ideas what might be causing that? Many thanks in advance!

Verified Answer
  • Changing BIOS sleep from S3 to S1 solves the issue, without affecting Wake Timers or anything else in Windows.

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