I've had my Predator for a little over three years now, I think. It's been great - no problems or anything....until a few days ago. I was playing a game and I heard a loud POP and the smell of burning 
It turns out the video card stopped working (GT645 I think). I had a friend verify that it didn't work in his machine and I ordered a new card off Amazon - a Geforce GTX 750 TI.
I checked the PSU (500w) and the connector types. It seemed like a good fit.
When I put the new card in - the ACER logo appears and the text 'Press del to enter menu. f12 for boot options' (or something like this) - just like usual, only in a higher resolution than before. Sounds great - only...the system hangs there. After ~30 seconds, it beeps once. Then another 30 seconds it beeps once more. 30 Seconds after that, the screen goes black and it just sits there forever.
I've checked the connections, removed/re-seated the card, tried the other 6-pin plug from the PSU, and all give the same result. The card has power and is outputting a signal, so I didn't think it was defective, and my friend was able to verify that it works in his PC.
I found people suggesting to uninstall the Windows drivers of the old card. I didn't think that would help - but I did it anyway I dual boot, so I went into both and uninstalled the GT645 drivers, but that didn't help.
I also found people claiming this was related to secure boot. My bios doesn't have any option for secure boot - I even watched the Acer YouTube video on it, so I know where it would be. I have the P01-A2 version and the newer version available on the Acer website says 'Not for upgrades' and, indeed, if I try to upgrade it, it fails because the sizes don't match.
Is there any way to install a new video card into my G3620? Will only certain ones work? The GT645 that I have is an OEM - so they seem hard to find. At least on Amazon they were.
Any help would be greatly appreciated.
