Mac Pro Having issues on start-up and sleep

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Level 1

9 points

Mac Pro Having issues on start-up and sleep

My Mac Pro is having significant issues on start up (will not boot-up) The harddrive and/or fan sounds like it is racing as soon as the power button is pressed. In order to get the computer to boot, I have to cycle the power up/off process 5-8 times.

I have also noticed in the last 24 hours that when the computer goes to sleep, it sounds like the hard drive and/or fan goes into overdive until it is woke from sleep mode.

I would be very grateful for any guidance.

Mac Pro Intel 2x3 Ghz, Mac OS X (10.7.2), Dual monitors, 16GM Memory

Posted on Oct 29, 2011 8:30 AM

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Answer 1

Best reply

ds store

Level 7

30,725 points

Oct 29, 2011 8:41 AM in response to noverr

Sounds like you need to have your SMC reset

https://support.apple.com/kb/HT3964

Perhaps your PRAM

http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html

backup while you have a chance

https://discussions.apple.com/thread/3358920

asking to moving to Mac Pro forum

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Answer 2

noverr Author

Level 1

9 points

Nov 3, 2011 8:16 PM in response to ds store

Thank you. I have reset SMC and PRAM - The computer still has trouble starting up and the fan will suddenly start racing unexpectedly. Any ideas on what this could be?

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Answer 3

X423424X

Level 6

14,265 points

Nov 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).

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Answer 4

noverr Author

Level 1

9 points

Nov 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.

Many thanks!!

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