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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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No video and USBs don’t work.

Recently replaced my logic board and now my 2009 Mac Pro turns on but I don’t hear a start up chime and no video shows with my original graphics card. I

would try to reset the SMC and PRAM but the USB ports are not working. What can I do? Any ideas?

Answered! View the answer I have this problem too

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It ended up being the CPUs not properly set in. You have to set the heat sinks a lot tighter than you think you do. After I tightened the heat sinks it boots perfect. No issues!

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Hi

I got exactly same problem , mine started after I tried to clean the keyboard

my can turns on fan starts to spin , gpu fan spin too , but nothing on screen and no light on keyboard, looks like usb not responding,

I have changed front panel, I changed power supply,

now I am going to change CPU before planing to change motherboard

please let me know have you managed to fix the problem, and what did you do

regards

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Change cpu , just buy cheap like x5660 or x5670 on eBay about £15-20

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Paul will be eternally grateful.
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