loud pop after cleaning my mid 2012 Mac Pro 5,1 El Cap with ATI Radeon 5770 GPU. Before the pop the screen went stripey so I cleaned it. It booted and ran for 20 minutes then popped and now chimes repeatedly when I try booting. Suggestions?.
The debugging steps when you see some activity, but it won't boot are:
Strip the machine down.
Remove everything is a slot including the graphic cards and the drives, and go for a [single, well-behaved] CHIME.
Once you have the chime, build back up ONE item at a time.
When you add something that stops progress, that item is likely BAD.
**If not getting a chime at all, there is a more complex variant where you also remove the RAM DIMMS, and watch the power light for a "help-me' code.
Alright, I will try this. I had no idea I could get a chime with an empty casing. It is spotless on the inside now so I will pull "everybody out!" and add one element at a time, trying to get a single chime with each component.
Thanks. HF25
GPU failed, Repeat chiming, cleaned, revived, Loud pop, repeat chiming.
