View Full Version : Two sick little macs

Devil rolla
12th March 2014, 08:27 PM
Hey Guys,
I have been the IT manager for my inlaws for a few years now but these recent two issues have me stumped.
The first one, my old macbook pro just boots to a grey screen - no spinning, nothing.
I dropped the stock disc into it and formatted the drive and rebooted it but same deal, grey screen and not loading.
video here > Macbook pro no boot - YouTube (http://youtu.be/VstSKQy4P7k)

Second is a macbook I bought off a forum member like a year ago. He said it needed a new pram battery to get it working. I have searched high and low and no-one in aus seems to have stock of it. I have seen a few on ebay but buying and shipping it is close to $70 and I want to be sure that is the issue before laying out the cash. If it could be something else have a look at the video and let me know.
video here > Macbook no screen - YouTube (http://youtu.be/-T_s4nV0x1Y)

Have always appreciated the wisdom from MT and hope you guys might have some suggestions to help.

12th March 2014, 09:11 PM

Macbook # 1 - is that the 2008 model with 8600GT? Short of swapping RAM, I'd suggest the GPU is faulty. It can be reflowed professionally or DIY (50:50 chance you'll have a working machine again, or a paperweight)

Macbook # 2 - or rather, Powerbook G4 :D Highly doubtful a replacement PRAM battery is the culprit - try resetting the PRAM and/or power manager, if you can ever get into Open Firmware. The RAM slots on these also flake out (usually the top slot) - try stripping down to one known stick of working RAM in either the top of bottom slot.

Devil rolla
31st March 2014, 09:01 PM
Hey Byrd,
when I hold down command+option+p+r the laptop boots to the desktop, but won't boot to the desktop without holding those keys.
thoughts ?

31st March 2014, 09:22 PM
Hi devil,

I'd try resetting the NVRAM/PRAM under Open Firmware:

Archon's Site - Mac Help - Zapping PRAM and Open Firmware (http://www.archonmagnus.com/computing/mac/openFirmware.php)

... then reset the PMU

About NVRAM and PRAM (http://support.apple.com/kb/ht1379)

If this doesn't help, you could remove the top case and disconnect the PRAM battery/connector (however as noted I've not heard of a PB G4 being to stubborn to boot even if the PRAM battery is dead, it suggests more a motherboard fault):

PowerBook G4 Aluminum 15" 1-1.5 GHz PRAM Battery Replacement - iFixit (http://www.ifixit.com/Guide/PowerBook+G4+Aluminum+15-Inch+1-1.5+GHz+PRAM+Battery+Replacement/224)

1st April 2014, 07:05 AM
My wife's 17" PowerBook did this. After a couple of PRAM resets to get it to boot it then completely died. I never tried a new PRAM battery.

Devil rolla
6th May 2014, 08:29 PM
So a new pram battery is the only option Byrd?

8th May 2014, 07:56 PM
I'd disconnect the PRAM battery and see how you go.

I've come across a few 2008 MBP with faulty 8600GT (assuming it is - you haven't said) - that output video but unaccelerated.

Devil rolla
22nd May 2014, 09:20 PM
Hey Byrd,
disconnect the battery and get the warning that the clock is wrong, aka missing battery. But I needed the command + option, p + r button to get to the desktop. So not the pram ?
just want to get it working enough for my nephew to do homework on. Got 3 macs here and can't even make a Frankenstein machine for him.