I just upgraded my cpu from a 3.16 GHz Core 2 Duo to a Xeon X5460 3.16 GHz Quad Core by doing the 771 to 775 mod. My mobo is a Gigabyte GA-P31-3GS with a paltry 2 Gigs of DDR2 SDRAM 666MHz. I'm running a dual boot system with OSX Lion 10.7.5 and Windows XP SP3. The problem I'm having is that my EVGA Geforce 9800GT 512 MB shows just a black and grey screen with a few white boxes (like a test pattern) after boot-up. Booting with -v revealed a problem with NVEnabler and someone (from the site that cannot be named) suggested making a custom DSDT which I did and was able to boot (using the old Core2 Duo) with Graphics Enabler=No and eliminating NVEnabler from S/L/E.
However, using the Xeon X5460 I get the same black and grey screen. I am able to boot with the Xeon if I disable the DSDT, use GE=Yes and with PCIRoot=0 but then I only get 1024x768 resolution and, of course, no acceleration.
What makes this so fustrating is it boots up perfectly with Windows XP! Anybody have any ideas?
Thanks in advance!
Oops. I forgot to mention that when I go to System Info it correctly identifies the Quad Core CPU as a Xeon X5460. And I also noticed that when I successfully booted with the Xeon (again DSDT off, use GE=Yes and with PCIRoot=0) Temperature Monitor no longer was able to read any CPU temps-only temp for my HDD.