Burn the VGA and Fix your iMac - Don't Pay Shitty Problems!!! - YouTube
iMac (27-inch, Late 2009) gpu issue (REBALLING) - YouTube
Reflowing a Macbook Pro GPU to no avail – Ursecta
My 12 y/o son is so excited. Found him a pristine Mid-2010 27" iMac for $100. Going to give it the SSD upgrade but he's stoked to start recording music with it :
Reflow on HD6750M graphics card | MacRumors Forums