Quick (Likely) Easy Monitor Blinking Question

[KingMedicine]

so i have 2 CRT Synchmaster monitors i run.

The last couple days, they have randomly started blinking (at the same intervals) off and on after windows boots up and my desktop is up. The monitors will go from normal to black to normal to black with about 1/2 second in between. I have to shut down the computer (which is no easy task when your screens are blinking like crazy) and restart it.

This blinking thing is new in the past couple days. I think it's happened about 5 times in the past 2 days. It's always started blinking within 2 minutes of windows booting up. And if it doesnt start blinking within the first 2 minutes or so, it will be fine (no blinking at all for several hours) until i restart the computer. Then, if its blinking after start up, i reboot and sometimes its fine and sometimes it starts blinking again.

this is a new PC with a p4 processor. other than a bunch of poker sites, this computer doesnt have that much on it. let me know if i need more info for a diagnosis (i dont know too much about computers).

Thanks in advance for any advice!

KingMedicine