I just recently bought a used Asus Q501LA laptop. It will power on, but it wont show anything on the display.The power light, front LEDs and caps lock light up.Here is what i tried out so far.
removed battery and held power button down for over 2 minutes
tried multiple sticks of ram
replaced fan (the original one wasnt spinning)
replaced wifi card
removed cmos battery then reinserted it
connected to an external display via HDMI
tried fn + f8 to switch to external display while hooked up via HDMI
None of these things worked. Any help would be appreciated!