Hello, i am running a hp pavillion with an integrated nvidia 3600 vid card. i recently installed a radeon 3650 1g vid card. after running for a week i noticed that the card was shutting off and repairing it self(?). last night the monitor stopped receiving signals. ( samsung sync master 920nw). it has a blue power button that blinks like it is in sleep mode. i bought a 520w power supply and installed it.
after about 10 min the moniter will come on
Is the Monitor new? If it is, it may be also the Monitor that is somewhat broken, if you are sure that it is your new AMD Radeon card, return it if it is under warranty.
It may be an driver issue. Did you install official Display Drivers from directly AMD? Don't ever install display drivers from Windows Update.
Also you could buy an HD 6570, which is faster and cheaper than an 3650.