I'm not sure how I would be able to test if the GPU Card is fried, but I do know that when I took the computer apart last week, checking for any lose connections, and then put it back together, it was doing the same thing that it was before I took it apart.
When I turn it on, the Power Indicator light stays on, the battery light shows orange when charging and green when full, but there isn't really much activity from the Drive Activity Indicator light, other than when I first turn the computer on. My guess is that if it were just the GPU, then the Drive Activity Indicator light would be flashing on and off, showing that it was accessing the hard drive, but I'm not sure.
Also, if it were a motherboard failure, would that stop the "Always On" USB charging port thing from working? Because it still works when the computer is plugged in. Or would that be set up differently and wouldn't necessarily be a symptom of a motherboard failure?
I was hesitant about creating a new forum post, because I didn't want to clog up the forums, but I will go ahead and do that as well.
It's been ages everyone...
So the only way to recover your notebook in its current state is with an SPI programmer. There is no need to desolder the MXIC SOIC either.
There should be nothing wrong with your hardware, as it's a reoccurring BIOS bug with the G75 series notebooks when changing boot order and or modes.
If you'd like to know how to go about recovering your notebook, you'll just need access to another PC and an SPI programmer such as the TL866A kit with a Ponoma SOIC8 5250 clip.
Let me know what you would like to do and I can help you out with repairing your BIOS image when the time arrives.
When I had my forum up and running back in the day, I had guides created for just this very thing. As you can see in my signature, the forums are no longer online/accessible unless you use the wayback machine here. I wrote what I came across when I did mine and it's been invaluable to everyone who has a DIY mindset.
In short however, it's fairly easy to do physically once the notebook has been disassembled enough to gain access to the SOIC pins of the BIOS chip, which IIRC is directly underneath the keyboard panel assembly on the G75 notebooks.
I'll update you once I have time to gather what you need to follow and you can go from there; few hours perhaps.
Regarding the BIOS image repair, have a read here.
As a side note, if you can disassemble a notebook to do a repaste on one of those models, you definitely have the astute "skill set" required to use a programmer.