MACPRO 2008 + HP LP3065 = Problems or Incompatibility

It works perfect 2 days after i buy the monitor but now i have the one big problem with ATI 2600XT and HP LP3065 monitor.
I start the MACPRO and the monitor and i dont see nothing,the monitor is in STANDBY.I try to boot in windows pressing ALT key -> same problem.
If i start first the MACPRO and ather 20 minutes i start the monitor ALL is OK.. but after 20-30min the monitor is BLANK SCREEN for 2 sec then is OK..after 1 minute same problem...BLANK SCREEN ..NORMAL...and after this it goes in STANDBY MODE and is dead.
I test the video card on another sistem and its OK.
THIS IS THE SECOND Hp lp3065 MONITOR who have the same problem ...NO VIDEO SIGNAL
is a problem or is a incompatibility between MACPRO and HP LP3065 ?? OR the monitor is BAD .
THX

I have the same problem. MacPro 2008 + HP 3065.
Generally, if I use the power switch (not the power button, the switch next to the power cord) and power it off for maybe 15 seconds, it works normally when I switch it back on.
To be fair, I had the same problem with my HP 2335.

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