Hi I fitted a new heat sinc, added some a RAM chip and fitted a DVD re-writer to my pc today. Nothing too tricky there, although im far from being an expert. When i went to boot the machine back up, i didnt get the normal green light on my monitor or any sign of anything happening. Instead i got the orange light suggesting no signal was being received. The PC booted up fine making all the right beeps etc as it used to. Ive plugged the monitor into my laptop since and its working fine. I tried re-seating the video card too, but that made no difference. Looking at the mobo etc inside, i cant see anything not plugged in, based on the work i carried out i didnt touch anything else. Though i did blow out some dust. Thinking back, this is the 1st heatsink ive replaced myself - and i had no idea how much thermal compound to use. Used a spot about the size of a quid coin and piled it fairly high - is this too much and has shorted something maybe? Anyone got any ideas? Thanks.