To determine if it is hanging when there is no image, do you see the HDD activity light blinking randomly ?
I remember in the older Inspirons, they actually made the mobo a tiny bit too big which created the slightest amount of flex, which cuased the RAM to have a couple contacts not touch the mobo - the result would be what you are explaining.
Also, the fact your video card only shows the standard VGA adapter, is another big red flag it might not be working and is the problem. Try going back into Device Manager and getting it to take the nVidia driver.
I think this comes down to 1 of 3 things:
flaky RAM Have you run memtest ? (just to rule it out)
If you go into BIOS, and stay there, maybe even let it run some of those Dell diagnostics options - does it ever go black on you ?
bro.. there is no blinking light, the hard disk indicator light is off
is memtest built in in windows? or i have to download one in the net?
Try pressing the key combination to switch between the inbuilt display and an external display when the screen is blank. Can you still adjust the (inbuilt) display's brightness (usually fn + up arrow/down arrow on Dells)?
Removing a driver won't cause the screen stay blank. If you can't even see the BIOS POST (ie. Dell logo) screen (after pressing the power button), it's not software/drivers, but instead the GPU or logic board itself.
As I stated previously, 8600M-series are like Sony timers. One day, the machine won't turn on. At least it wasn't a 17" MacBook Pro you paid Apple $3,000+ for.
yeah.. after it turned it on., its black.. no logo
could it be that due to overheating, some parts of the board is fried/toast??
because overheating is my first issue and it always shut downs back then, so i bought a cooling pad and it is running smooth at that time