Answer for:

Monitor Won't Stay In Standby

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Normally what 'wakes up' the monitor is the presence of a video signal from the PC. So if the monitor wakes up without it's signal cable plugged in, then there could be a more serious issue.

If the PC is truly fast asleep, then either you're getting a juicy power surge through the sleeping PC or from the power mains, as Col alluded to, above, or perhaps the monitor and/or it's power supply is going bad.