2007 wfp constant screen blackouts

For the past 2 months my Dell 2007wfp has been experiencing constant screen blackouts. My monitor may be working fine then if I decide to turn it off (just the monitor) and then turn it back on the screen will flash on for a second then revert to and stay black. I like to keep my computer on for work purposes but also will turn off the monitor if I'm not using it, yet if I turn my monitor back on the screen will stay black. The DVI (2) display and on/off display will be green yet the monitor screen itself stays black. If I put my computer to sleep and I try to wake it back up, the computer will come back to working condition but the monitor rarely will. If I restart my computer the screen will stay black. Just now I left my computer on as I watched a TV show, the screen saver came on, then power save so it turned off my display (as it should) yet when I came back to use my computer the monitor would stay at a black screen even though I have green lights and not amber. I restarted my computer twice and the display would stay black. I had to shut it down and just give up until the monitor was ready to come back on. I turned on my computer and monitor (from cold) and now it works fine for now. I've tried a different monitor and did not experience this problem. My only solution so far is to avoid turning off my monitor. If I was to turn off my monitor right this moment and then turn it back on there's a very likely chance the screen would remain black unless I shut down/restarted. Any help is appreciated. Thank you. My specs are Vista Home Premium Athlon 64 3200+ 1.5 GB RAM 7600 GT