After a PRAM reset my MBP 1,1 display is split into 4 parts each displaying the same image. What is causing this and how can I fix it?

After resetting the PRAM/NVRAM (control, option, P, R) on my Macbook Pro 1,1 (2007) running 10.6.8 The screen is now split into 4 parts, each displaying the same thing. The screen immediately appears this way at the first grey screen, however if I do another NVRAM reset, upon restart after the second startup chime, the screen is normal but once it gets to a certain point around thetime the cog stops spinning, the screen flickers, turns blue and splits into four again.
Another thing is when I tried using the Apple Hardware Test I couldn't read the instructions as the resolution was too small, but once I restarted and change my display resolution in System Preferences, the resolution was readable in AHT. I assumed the System Settings were loading when the OS had booted and that AHT runs without any of these settings (if that makes sense?)
I've not used any third party utilites and everything working fine except for some battery issues which are gone now (the reason I tried the PRAM reset)
Any help would be much appreciated

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Press and hold Shift and left-click the Reload button.
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (MAC)
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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After a PRAM reset my MBP 1,1 display is split into 4 parts each displaying the same image. What is causing this and how can I fix it?

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