psihopata

I just got new gpu, instaled lates drivers etc, after some time off playing (15-40) i randomli get  2 problems i will state down:

1) my monitore turns off, PS still working but no picture, have to restart...
or,
2) i get black screen for 1 sec then:

(this is picture taken with my self phon cose everything freez) onli restart help.

With my old Gpu everything work fine (but lower FPS, in wvwvw and with 20+ players, ofcours )

PC spec:
ASUS P5QL SE
intel core2duo 7400 @2.8ghz
4g ram
new GPU: msi HD7850 1gb  latest drivers 12.8
old GPU: ati radeon 4670
new power supply: LC Power 600W
old power supply: blueberry 450W
win XP

i am not expert, thats why first thing that came on my mind is that card have defect or something, i try v12.6 and v12.8 drivers same probem.

Any1 can tell me what are possible problems, and what can i try do to fix it?
thx for help in advance.