Mac Pro A1502

[Tekbox]

Hi -
I have a no boot problem I cannot solve. The chime will go off, the screen stays black, common problem I have fixed before but this one is different. If I hold in the shift key the system will come all the way up to the login, until I let go to type the login pw, then off it goes. So I figured it was the logic board, nope. Same effect. Next, I put a new blade drive in, press and held command + R for recovery, great, up it came to pick a network. Let go of the command and recovery, down for the count. So at this point I am tired of guessing and investing and I need some ideas. Thanks for any help.

 

[MacsBug]

Have you tried zapping the PRAM? Whenever I have replaced a blade drive in a MacBook Pro the drive isnt recognized until the PRAM is zapped. Command Option P R

 

[Tekbox]

I thought I did, but at this point I am desperate. I will hit it again and post back thank you.

 

[Tekbox]

Nope, no luv , did the PRAM, then did the Command + R, begins to slide a bar over until I let off the keys then screen goes off. This is wild I have never had a problem like this before.
*Edit tried it a second time, recovery mode came up until it came time to let me type in password for recovery network, when I let go of CMD+R lights out

 

[MacsBug]

Next thing to try is to reset the SMC on your MacBook Pro.

To do this...

• Shut down the computer.
• Plug in the MagSafe power adapter to a power source and to your computer.
• On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
• After 5 seconds release all the keys including the power button at the same time. (Note: the LED might change colors)
• Press the power button to turn on the computer.

 

[Tekbox]

Thank you for the answer and sorry for the delay, I am buried in work. I tried your procedure, I got the chime, and a black screen, nothing more.

 

[MacsBug]

Is the new blade drive compatible with your model of Mac? It is possible that you have the wrong blade drive installed.

 

[Tekbox]

Almost completely identical (The one ending in AO2 is the original) and as long as I hold shift down it will make it all the way to the login screen no problem at all until I let go of shift.

 

[TonyAguila]

Try this terminal command:

sudo nvram StartupMute=%00

Type in your password and press return. Let us know.