Mac pro doesn boot ... sometimes
Hello again
By hitting the power button of the Mac Pro one of the following happens:
- the power-on indication led goes on, the cooling fan switches on but after 5 or 6 seconds it stops and the power on led also
- the power-on indication led goes on, the cooling fan switches on. This situation stays "forever" and nothing happens. No chime or whatsoever. Not even after 4 or 5 minutes. The only option is to hold the power-on button until shut down of the Mac Pro.
- the power-on indication led goes on, the cooling fan switches on and after about 10 - 20 seconds: "chime"! Screen flashes on and after some more 10 - 20 seconds the progress bar comes up and OS is booting.
Situation 1 and 2 are repetitive, so you have to power on several times and end in 1 or 2, before step 3 happens. This is far from being "normal" behaviour I was used to some 2 years ago; yes the Mac Pro hasn't been used for this long period.
So far:
- I have exchanged the cmos back-up battery, which turned out to be not necessary at all: voltage was 3.0 Volt.
- refreshed the nvram
- exchanged the original boot ssd with another boot ssd OS
Nothing of the above helped. So I hope someone can give me (a) more systematic procedure(s?) to tackle this. Starting up the Mac Pro was a breeze after the exchange of the original (spinning) harddrives with ssd's: never more then 10-12 seconds and all programs up and running.
Any suggestions, please?
Earlier Mac models
