Black screen on hp dv6 after installing AMD CCC for AMD Radeon HD 5470

Hi HP experts,
it started when i was playing on my pc and the screen went black and the laptop shut down. i'd reopen it and after the windows loading screen everything is black, i hear the welcome sound and when i swipe my finger on the biometric reader i hear also the sound announcing that the windows session has been started.
So i've started the laptop on failsafe mode and it's ok. i have disabled the intel HD graphic and i restart in normal mode, the display is ok. so i came back in failsafe mode and i enabled the intel hd graphic and i disabled the AMD Radeon HD 5470 and also it's ok in normal mode. the problem is when i set both of them enabled i will have a black screen in normal mode.
i have formatted my hard drive, reinstalled windows 7 64bit ultimate and i've installed all the driver from HP support web page except the two graphic drivers Intel High-Definition (HD) Graphics Driver and AMD High-Definition Graphics Driver.
Is there anyway to test if the AMD graphic card is not ok? can you confirm that it is not a haedware issue?
I'm in big troubles guys, i've work to finish ASAP, please i need help.
Thank's
HP Pavilion dv6t-3000 CTO Entertainment Notebook PC
intel i5 M450
AMD Radeon HD 5470 with Intel HD graphic
Windows 7 64bit
DirectX version : DirectX 11

@Saber1109 ,
Hello and welcome to the HP support forums. Sorry to hear about your video issue. Based on what you have already done here it shows a definite hardware issue at this point.
You have reloaded the Operating system from scratch. Format Reinstall. Installed drivers from scratch.
At this point you have done all you can do as far as software is concerned. At this point I would contact phone support for repair options.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Thank you again for posting and have a great day.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
D5GR
I work on behalf of HP

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