Tried the "Apple Bake" on my early 2008 macbook pro and it worked, does that mean for certain it is my Nividia chip that is bad?

So I had my early 2008 macbook pro (A1260) not wake up after clamshell sleep. After researching the boards felt confident it was the logicboard issue. Not being able to afford a replacement I decided to try the "apple bake", as I have been employed as a maintenance tech for a corrugation company and was comfortable doing the work myself. Anyhow it worked (350 degree f - 8mins) and my mac was back to life working as normal except for the fans running at %100 all the time. The fix was short lived, only lasted about 5 weeks and wouldnt wake up from sleep again. (yes, I applied new thermal paste the first time haha) I did the bake again and again it was revived this time fans working properly (still not sure what that was about) I have since had to do it one more time and now I just dont ever close it or let it go to sleep. I found a guy online who will replace the gpu for a good price ($150), my question is, is it actually the Nividia chip thats the issue and not something else? Is there any other issue that would be reolved by doing the bake and Im just thinking its the faulty 8600 geforce chip?
Macbook Pro 4,1 - 10.6.8 - 2.6ghz Core 2 Duo - 4gb 667 Mhz DDR2 SDRAM
Other issues I had aside from not waking up from sleep
-Strange feedback noise coming from speakers in between any audio being played. (intermittent) any audio will stop the noise. (might be unrelated)
-Dark lines from bottom of screen to top. Screen reset will fix (shift+cntrl+eject)
-Pixeleation when gaming (intermittent)
Any help would be appreciated,
Thanks in advance

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This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
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Tried the "Apple Bake" on my early 2008 macbook pro and it worked, does that mean for certain it is my Nividia chip that is bad?

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