Can't install Lion on Mac Pro 5,1

[Markintoshx]

Help! First time in my 20 years Mac-life I have such a crazy problem. Downloaded Lion from Mac App Store and sucsessfuly installed on iMac i5 quad and MacMini 1.83 Core2Duo. When I tried to install on Mac Pro 6-core 3.33Ghz/24Gb — After restart Mac hang on "Install" screen. Inside MacPro I have 5 drives I tried to install on 3 different drives. After bad attempt I did clean install of SL, and tried to install Lion on fresh system (I did all updates before installation) — same result. Next time I took out all hard drives — left just one, it didn't helped at all. I give up after 5 attempts — this is not have to be so crazy. Again, on iMac and Mac mini everything works right away. Any ideas what can't be wrong? Thanks in advance.

 

[Paratel]

Did you ever get this installed? I have the same problem as you. MacPro 2 2.66 XEON running SL 10.6.8 multiple attempts, pulling drives etc. I even tried is on another drive but it keeps hanging on the grey apple screen and the little status wheel just stops. Multiple calls to apple with no relief.

 

[Paratel]

Update

Contacted Apple again and apparently after running some tests, the engineers determined that the cause of the problem was the video card. I am running a NVidia 8800 GT 512mb. Have no problem with the card at all. Apple sent me another card and the install of Lion went off without a glitch. MacPro is outside it's warranty but Apple was kind enought to send me another card anyway. Thanks Apple!