HP probook 4720 graphics Blue screen of death

Question

I have an HP probook 4720s (Product #: WT238EA#ACQ). I have upgraded my RAM to 6GB.
My problem. The other day I was busy playing a game when the computer froze and then turned off while it was turning off a small blue screen briefly appeared. I restarted the laptop and everything seemed fine, I left the computer for a few minutes and when I came back the screen was completely off but the computer was operating as normal. No key press or anything would put the screen back on.
Everytime after this event that I tried to put the laptop on it would start(HHD spin, CPU fan work, HDD light would blink for a bit then stop but the screen would stay completely black with no blue backlight). I tried hard reset and a number of other things like checking if the RAM was connected properly and still the screen remained off.
I decided to connect the laptop to an external monitor and I finally could display on the monitor but it still would not display on the laptop screen. After the windows emblem loaded the dreaded blue screen of death would appear with a STOP error 0x00000116 which after some looking up appears to be the graphics driver. After safe starting the system and rolling back the graphics driver to standard VGA adapter the windows 7 system was then able to start in normal mode. I've tried reinstalling the HD 5470 graphics driver but the blue screen of death continues to appear. I have completely reloaded the OS to no avail.
I disconnected the laptops screen from the motherboard without the graphics driver loaded, which didn't cause a beep but displayed on the external monitor when I connected it. I tried the same with the graphic driver loaded, still no beeps were heard and when I connected the external monitor the blue screen appeared.
From the tests I had tried, I believe that there must be an issue with the graphics card itself as the Blue screen of death only displays when the graphics card driver is loaded.
Could you please advise on what you feel I should do, Some assistance with this matter would be much appreciated. I appolagize for the long message.
Regards,
Byron
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Answer 1

Hi @Bax23 ,
Welcome to the HP forum! 
To get your issue more exposure I would suggest posting it in the commercial forums since the probook 4720s is a commercial product. You can do this at: 
Notebook - HP ProBook, ZBook, EliteBook, Compaq, Slate/Tablet PC, Armada, LTE.
The support page for your product may be helpful in the meantime:  HP ProBook 4720s Notebook PC
I hope this helps.
Sparkles1
I work on behalf of HP
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