My Mac pro 2008, not running after the Apple logo, i rebooting and i rebooting
My Mac Pro 2008 no boot afther the Logo Apple, reboot, reboot and reboot only, and in XP, the graphic is pertubed with bad graphics ... the mémory it's good, and i thinks my card graphic is out. SRY for my english, it's not my language. Help my please, my apple care is finished 10/2011, and i will repared itself. Many thanks. Alain Muno
Not saying this IS your problem, but … I just went through avery similar problem with Mac Pro3,1. Here is my story.
On boot of any Mac OP system drive, internal or externalHDD, (Lion or Snow Leopard), original Mac Pro install CD, Snow Leopard CD,nothing. (Would only go to gray screen,apple logo, spinning gear that would stop spinning after about a minute.) But, it would boot on XP drive. However, in XP, on Windows black startupscreen, had alternating columns of two different patters of blue dots and XPgraphics were not as they should be (larger icons on desk top, slow response,different size of desk top (maybe 600x400 when it should have been1024x768). Supplied hardware test showedno failures. Took it to shop. Their better diagnostics showed nofailures. All peripherals (my drives, myCDs, etc, disconnected. (NOTE: they didnot try a new video card since they did not have one.) Still would not start even using their drives(external or internal). Shop tried a newlogic board. That did not work and theyput the original one back in. Shop saidall they could come up with was new processors. This was not a cost effective option and they had none to try.
After thinking about it more, I figured it could be thevideo card: the original 8800 GT that came with the Mac: that it was so bad itwould not start in Mac OS but would limp along in XP. I was all set to buy another vid card one-bay just to try. While doing thatresearch, came across several articles on the Internet that discussed vid cardfailure due to micro-cracks in some solder joints. These develop due to age/heat cycles. The proposed fix was to ‘reflow’ the solder. Figured it was worth a try before spendingthe money on a new vid card. Found thesedetailed instructions on youtube. http://www.youtube.com/watch?v=T7um_hZYom4 I followed the procedure, put the vid cardback in, and now it works just fine.
I did not and would not do this until I had ruled outeverything else. But, it has worked forothers and it did work for me.
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