Hi, I have a mid 2010 Macbook. Yesterday whilst streaming video the video started to fade out to white but the audio remained. I had to long press the power switch and reboot but on startup the screen showed the apple symbol after the chime but then froze. This happened about 5-6 times until it booted up properly and I continued to used it for the rest of the evening with no problems. I powered my Macbook up today and the same thing happened but instead of the apple showing there was just a mesh of crossed coloured lines all over the screen. This time it has taken about 10 attempts to reboot before I can boot correctly and I have now been using it seemingly with no problems for about 2 hours. I have tried to use the hardware test but if I boot and hold 'D' nothing happens, it just boots to the desktop (could this be because I have upgraded from Snow Leopard to Lion?). I have also tried to run the hardware test from the Install disk but can't seem to find the correct menu. I called a local engineer who told me that without doing diagnostics it seems as though the video card is on the way out and would need to be replaced. He has just emailed me a quote for the card only which comes to ₤420 + VAT (In which he also described the card as a Logic card?) which is quite worrying as I am no longer under warranty. Does this seem a reasonable diagnosis with the little information that I have provided and is it really that expensive to get fixed? If anyone can offer me any help it would be very much appreciated.