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No signal with new graphics!

Last response: in Graphics & Displays
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September 3, 2012 8:42:22 PM

hi guys.
earlier today i picked up an asus 1GB 4870 from my friend. but i'm having trouble.
when i run the HDMI now, i get no signal at all. i've tried setting up many ways and in every port possible.
i also tried a VGA connection, success! until i install the drivers and restart the system, now it comes up with 'invalid format' instead of no signal, on VGA. tried the HDMI connection again, still no signal!!
please help!

More about : signal graphics

a b U Graphics card
September 3, 2012 10:05:18 PM

boot into safe mode ("F8" at startup) and change the display resolution.
September 3, 2012 10:41:17 PM

i'll give that a try, but i dunno how i'll select it, there's literally nothing even from startup :/ 
September 3, 2012 10:45:16 PM

i just tried F8, but honestly, there's no way of even selecting a boot mode :( 
!