Currently Being ModeratedOct 29, 2011 8:41 AM (in response to noverr)
Sounds like you need to have your SMC reset
Perhaps your PRAM
backup while you have a chance
asking to moving to Mac Pro forum
Currently Being ModeratedNov 3, 2011 9:07 PM (in response to noverr)
Since smc and pram reset didn't help I'll just mention a couple of suggestions:
1. Make sure you've blown the dust out.
2. Disconnect all possible peripherals (usb's, hdd's).
Currently Being ModeratedNov 12, 2011 10:29 PM (in response to X423424X)
Ok, I think I finally found the problem. I replaced the vidoe card on a tech friend suggetion as fan for the old was the culprit in the loud racing. After installing the new card, I had a very hard time starting up and when it did the screen would sometimes go blank and the video card fan would start racing. So I did what you suggested and discounted each peripheral and finally found that the one item that was causing the issues was the USB multi-hub that I had put in several weeks ago. The computer now resists any connection to this. Have any suggestions on a USB mulit-hub that does not cause the problems? I need some extra ports.
Currently Being ModeratedNov 12, 2011 11:27 PM (in response to noverr)
Was it a Apple USB modem by any chance. This apple modem FAQ says it's incompatible with Lion.
I don't have any opinions on usb hubs (I assume you want a powered hub) one way or another.