Hi Guys,
Hope you can help, I have a 27 inch 2011 iMac, had the GFX card heat issue, re flowed it and sorted but then thought I'd upgrade it, so got a 6770 off eBay, and I also have a 256mb version (whatever model thats called), however when its installed, the computer doesn't power on, 1st LED only, press power button, some fans come on, then all turn off, then all ramp up, PSU makes a sorta faint squealing noise, unplug graphics from mxm slot- 2nd LED boot chime etc, or put in old card, boots up no dramas.
Clearly its got something to do with the new GFX card, but what is causing it?
I also have another card thats does the same thing?
Hope you can help, I have a 27 inch 2011 iMac, had the GFX card heat issue, re flowed it and sorted but then thought I'd upgrade it, so got a 6770 off eBay, and I also have a 256mb version (whatever model thats called), however when its installed, the computer doesn't power on, 1st LED only, press power button, some fans come on, then all turn off, then all ramp up, PSU makes a sorta faint squealing noise, unplug graphics from mxm slot- 2nd LED boot chime etc, or put in old card, boots up no dramas.
Clearly its got something to do with the new GFX card, but what is causing it?
I also have another card thats does the same thing?