Chosen Solution
Hi everyone few days ago i bought Mac Pro 4.1 Quad Core Xeon 2.6, 16GB ram, GeForce 120 for pretty cheap, all components should be functional but computer had one problem, seller told me it freezes during work and after restart it works normally again. I tried installing Mac OS on USB Drive and run it from that till i find out what is causing that problem after what i would buy SSD, but now i can’t even boot it. When i press power button everything starts spinning, but nothing on display and it doesn’t play that Mac startup sound…. and also i have red indicator on the CPU tray, do you have any idea what can cause this problem, i tried swapping ram modules, changed battery, nothing changed. And also i should mention screw is missing on CPU tray at least 1 if not more. Maybe that can cause some problems? I would be very grateful if someone can help me solve both problems, thanks in advance :)
Lets see if the former user tried upgrading that CPU. Please give us your serial number or you can do it and post your results on your 2009 Mac Pro. Posting a photo of your LEDs when it fails to boot might help us too. https://everymac.com/ultimate-mac-lookup… It looks like this one: Apple Mac Pro “Quad Core” 2.66 (2009/Nehalem) Specs Identifiers: Early 2009 - MB871LL/A - MacPro4,1 - A1289 - 2314 I would also ask the seller what he has done on it and if he knows what the issue is. UPDATE 9/5/19 Perform an SMC reset by: removing AC power cord. press and hold the power-on button for a quarter minute to drain the power capacitors. re-Install AC power cord. attempt to start up normally. Here’s the Technician Guide: http://tim.id.au/laptops/apple/macpro/ma… See page 36-37 That appears to be a CPU failure LED. You really need to ask the former owner what he has done.
