Mac Pro 2012

[EirikStrand1996]

when i started my mac i was like this
when i got i from my girlfriend it was 5 years old so i got an SSD and new ram for it,
but its 2 Harddrives in it, the original HDD is there for more space, but the OS is on the SSD

 

[Adamantoise]

Have you successfully booted it since you put in the RAM and SSD?

 

[Audit13]

Bad hard drive cable? Boots from an external drive?

 

[EirikStrand1996]

Have you successfully booted it since you put in the RAM and SSD?

yeah, i been using it like 6 mounts

 

[Audit13]

Try booting with the ssd in the DVD slot.

 

[Adamantoise]

yeah, i been using it like 6 mounts

Have you tried resetting the PRAM/NVRAM?

You do so by:

1. Shut down your machine. Yes, all the way down, not sleep or logging out.
2. Press the power button and then press command-option-p-r. You have to make sure you get those keys pressed before the gray screen comes up or it won’t work.
3. Hold those keys down until your Mac reboots again and you here the startup chime.
4. Let go of the keys and let your Mac reboot normally.

If that fails, I hope your work is backed up because you may need to resort to the recovery partition.

 

[ZapNZs]

Bad hard drive cable? Boots from an external drive?

This would be my guess and troubleshooting attempt.

IIRC there is still a free SATA cable replacement program going on.