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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Powers on , chimes , fans run , USB and FW devices work , no video

I have a 2009, 8 core Mac Pro, until a couple of nights ago it was running fine, then no video.

On starting up, it chimes, you can hear hard drives working. My FW800 external drives all flicker as normal while they mount; ditto my G-Speed eSATA external array , my USB scanner and printer each make the usual noises, suggesting USB bus OK too.

My desktop monitor is DVI, I tried connecting to my monitor in the living room using a DVI - HDMI cable, no difference, double checked my desktop monitor by connecting my laptop - monitor OK.

Opening up the computer it was very dusty - I blow the dust out a couple of times a year by bringing the airline from my garage compressor into the house. Blew it out, computer fans all turning silently, the small fan on the ATI graphics card felt stiff and wasn’t turning .

Took the card out, blew compressed air through in every direction, fan still felt stiff, sprayed with electrical cleaning solvent Aeroclean fan now runs smoothly, also wiped and sprayed edge connectors on card and reseated fan plug in cable on card. On reinstalling card, fan now runs healthily and silently, but still no video.

I have a couple of previous generation Mac Pro computers , 4 core instead of 8 core , slower bus speed etc ; tried the graphic card out of one of these , no good . Also tried the system drive from that machine in case mine didn’t have correct drivers , no use .

I’m leaning towards thinking the fan on my graphics card has seized up with dust & dirt, causing the card to overheat. Does this seem the most likely scenario? The computer is normally on all the time since if I’m not sitting at it, it is either downloading or processing video or photos. I recently got the other two Mac Pro’s which were being disposed of at work to take some of the more mundane tasks on.

After the graphics card, I can only think the power supply might be bad - not sure if my 2008 machines will have the same PSU ?

Would appreciate any thoughts , anything I’ve missed ?

Update (09/12/2021)

Correction: My machine is not a 2009 as I thought , it is a 2008 model A1186

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Hi , I will look into this next ; since the graphics card fan was clogged with fluff and dust to the point it wouldn’t run , I suspect it’s likely the card has fried , so I’ve ordered a better card which was only £34 inc postage and will be here in a day or two .

I will certainly look at the PSU next if that doesn’t sort it . I’m quite used to replacing leaky caps in audio , radio and video kit , it is something I’m well versed in . I’ll also look whether the PSUs are the same in the other two Mac Pro’s I have here , both also A1186 models , although only quad cores rather than 8 cores

If I need to swap one over to get back up and running , I can then repair at my leisure .

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Can you open up the machine(including the PSU, and graphics card, if possible) and check for any leaky or bulged capacitors like the picture below?

Block Image

If the computer or its components use SMD capacitors (see picture below), check if the board has a fishy smell.

Block Image

A Capacitance and/or ESR meter may also be helpful in this task.

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