My Mac Pro has been acting strange on boot lately. When I hit the power button, the fans rev up normally, then there is a pause, the Apple chime sounds and instead of instantly getting the grey Apple boot screen the screen stays blank for about 20 seconds. Then I get the grey boot screen. I tried resetting the video controller by unplugging all things connected to my Mac Pro, unplugging it from the power source and then rebooting with nothing plugged. Didn't solve the issue. After this odd startup, the computer boots into OSX fine. The OS works great. It's been over two weeks since I installed AHCI on Windows with gugucom's method and haven't had any problems since and none now except for this boot issue. MP boots into windows 7 fine. Only thing is that in SL when I hit shutdown or restart the MP doesn't always do so right away. Furthermore, I just took a look in disk utility and the order of my disks has completely changed. My initial disk order was: disk0: Macintosh SSD (BootDrive) disk1: Win7 SSD Bootcamp disk3: 1.5TB WD Backup disk4: 640GB stock Apple HDD Now Disk Utility reads: disk0: 640GB stock apple HDD disk1: 1.5TB WD Backup disk2: Win7 SSD Bootcamp disk3: Macintosh SSD (Boot) How can I fix this boot issue. Can this be caused by the patching of my Win7 MBR for AHCI install even though I haven't had issues until yesterday? Any ways on how to fix this. If this may help... I have a 2.0TB WD HDD set up in Time Machine with several backup points however I have been working on a powerpoint project in Windows. Will a restore (if necessary) also restore my Windows drive to a previous date or not? Any help is welcome.