Stops at white/gray screen with spinning beach ball

[reiters]

I have a Dell t5400 desktop running 10.8.2 for quite some time. I have not gotten anything newer to load. I tried 10.8.4 and everything above. I have a modified DSDT I have used forever that tweaks the way it assigns IRQs to the SATA controller which allows the installer to see the drives otherwise it reboots wiping the bios settings. Every version after 10.8.2 installs fine and I can boot into safe mode to install multi and add the DSDT to the new install. If I try to boot without safe mode it stops on a white screen with a spinning beach ball. The drive still looks active. The ball never stops spinning and the mouse will move it around. I have tried many many combinations of boot settings (npci, PciRoot, PciRootuid, GraphicsEnabler etc). I actually charted out all the combinations and tried them one at a time. I have 2 drives in the machine. One with the current working 10.8.2 and one with 10.10.??. I am more than happy to collect any information from screen grabs or files and share for assistance. I am at a loss and would love to get a little more life out of this computer. My video card is a ATI 6870 with 1g ram. No other addon cards. 16G system memory. Drives are SATA and a SATA DVDRW. I am sure it's my lack of understanding that is limiting me. I suspected for quite some time that it was a video card issue but now I'm not so sure. Also I have used the HDMI port and the DP port on the card (cord was DP to HDMI). What am I missing?

Here are the last few lines from the system.log
Jan 10 14:00:28 XXXXXX-Mac-Pro.local com.apple.kextcache[193]: kext-dev-mode allowing invalid signature -67062 0xFFFFFFFFFFFEFA0A for kext FakeSMC.kext
Jan 10 14:00:28 XXXXXX-Mac-Pro.local com.apple.kextcache[193]: kext file:///System/Library/Extensions/EvOreboot.kext/ is in hash exception list, allowing to load
Jan 10 14:00:28 XXXXXX-Mac-Pro.local com.apple.kextcache[193]: kext file:///System/Library/Extensions/ElliottForceLegacyRTC.kext/ is in hash exception list, allowing to load
Jan 10 14:00:33 XXXXXX-Mac-Pro.local com.apple.kextcache[193]: kext file:///System/Library/Extensions/AHCI_3rdParty_SATA.kext/ is in hash exception list, allowing to load
Jan 10 14:00:37 XXXXXX-Mac-Pro.local mds[32]: (DiskStore.Error:1417) Unexpected file dev:16777223 storeDev:16777218 mode:41ed hint:408776 oid:408776 ino:2 fsEvents:0 /Volumes/Mavericks -- /Volumes/Mavericks
Jan 10 14:00:37 XXXXXX-Mac-Pro.local mds[32]: (DiskStore.Error:1417) Unexpected file dev:16777221 storeDev:16777218 mode:41ed hint:408772 oid:408772 ino:2 fsEvents:0 /Volumes/Mtn Lion -- /Volumes/Mtn Lion
Jan 10 14:00:37 XXXXXX-Mac-Pro.local mds[32]: (DiskStore.Error:1417) Unexpected file dev:16777222 storeDev:16777218 mode:41fd hint:408781 oid:408781 ino:2 fsEvents:0 /Volumes/Stuff -- /Volumes/Stuff
Jan 10 14:00:37 XXXXXX-Mac-Pro.local mds[32]: (DiskStore.Error:1417) Unexpected file dev:738197505 storeDev:16777218 mode:416d hint:401368 oid:401368 ino:3 fsEvents:0 /net -- /net
Jan 10 14:00:37 XXXXXX-Mac-Pro.local mds[32]: (DiskStore.Error:1417) Unexpected file dev:738197506 storeDev:16777218 mode:416d hint:401369 oid:401369 ino:5 fsEvents:0 /home -- /home

 

[reiters]

I manually removed the ati drivers and NV drivers and now it will boot all the wya to a desktop without needing safe mode. So I assume it's a video driver issue. What might I be missing? I've always used 3,1 as my machine type. Does that make any difference?