We had this problem back in January. For some reason, the computer was sending a power saver command to the monitor. We shut off the computer and let is sit for 5 minutes, restarted, then tinkered with the power settings so that it would never enter sleep mode. Working fine ever since.
Malibu Sally, 50 En/Dev Blaster
Madame Nabiha, 47 Nec/Dark Mastermind
Human Tomato, 37 Claw/Regen Scrapper
System Five, 26 Claw/Regen Stalker
Admiral Phogg, 15 Storm/Elec Defender
Ravishing Roy, 21 SS/Inv Brute
Moonwasp, 7 Warshade