I just built my system about 2 weeks ago. Everyone was working just fine. I have not touched any overclocking properties and everything is running stock from the box. I have my computer to shut monitor off after 5 mins of no use and go to sleep mode after 15 mins of no use. Just yesterday when i would wake it from sleep mode, it would not display any graphics. I have to hit the reset button to get the graphics to come back. Sometimes it would work after one reset, sometimes it take 3. I am thinking my GPU is the culprit. When the computer comes from sleep mode, it sounds like it is doing what it is suppose to. All drivers are up to date and i even re-installed the GPU driver. Even if i disconnect the monitor cable and reconnect its a no go.
After suffering with lots of go to sleep and wake from sleep mode issues with ATI graphics - I do not think its your graphics card. There is a possibility but it is driven via the driver and we all run the same driver. My system would take 5 mins to wake from sleep until ATI released 10.1 and then everything started to work - well except it still wont go to sleep by itself...
You infer it was working for awhile? Was it? Or did you just get around to tuning sleep mode?
Power supply has a lot to do with waking from sleep - what size, are you using a dedicated power line from the supply?
What interface from the card to the monitor - did you check both ends of the connection? I have seen things like this with 19x12 or 19x10 monitors using single DVI connectors - try a DVI - dual link cable (single cables are identified by having two sets of pins, dual go all the way across).
That it doesnt start after a reset concerns me. Could be the card, PSU, memory, motherboard, add-in cards...pull everything you can out and see if it will work. Pull out all RAM, extra drives, DVD (disconnect them - you dont need to remove them) and see if it works.
If not then RMA the card, but be prepared to start replacing other components...
It was working until the other day, i would come home from work each day and click the mouse button and it would turn on right away since it was built. When i got home the other day i clicked the button and the cpu would come on but the monitor wouldnt.
I have a CORSAIR 850W, only the fan plugs into the PSU, the grafics card gets it power from the PCI express MOBO.
i have tried multiple video cables with the same results
I dont know the driver right now, i am at work for the night i will check when i get home in the morning
all drivers have been updated and i am still getting the problem. Now the computer wont go to sleep but after 15 mins it shuts off the monitors and doesnt bring them back unless i reset the cpu. Now i only have to reset it once for the monitors to come back though.