Windows 7: HD 6850 :- No complete boot when hdmi attached

I have AMD Radeon HD 6850 and using only hdmi-hdmi cable.

With hdmi attached and pc turned on, the hdtv shows no signal but the power LED is on for 10-15 seconds then goes off for about 2 seconds and then restarts and follws the same.



With no hdmi attached and pc turned on, after waiting to boot completely and then re-plugging hdmi i am able to get signal. I directly saw dektop screen on my hdtv. Then pc works fine with no problem.

Even if i restart it from desktop it works fine until shutdown but no signal and power led blinking after that.

I also updated CCC but during installation tv went to no signal. I finally had to turn off main supply. After struggling on pc to turn on, i saw CCC was updated.

Also i am not able to enter the bios.

Please help to solve this problem.

I dont want this struggle any more.

Thanx in ADVANCE