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macrumors 65816
Original poster
Aug 17, 2007
My mid 2007 MBP seems to be locking up during CPU intensive tasks, such as, emptying the trash containing large files and other tasks that make the fans scream. Two things were done before this issue has came up. First I installed a OWC 3G SSD and then I upgraded to Mavericks when it was released. I even get lock ups while just surfing, but usually it's when I'm multi-tasking or something as stated above. Any thoughts?

thanks in advance! below are my system configs.

Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B07
SMC Version (system): 1.16f11

OWC Mercury Electra 3G SSD:

Capacity: 240.06 GB (240,057,409,536 bytes)
Model: OWC Mercury Electra 3G SSD
Revision: 506ABBF0
Serial Number: EX3G24013E10V0051
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Medium Type: Solid State
TRIM Support: No
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified


Staff member
Jan 23, 2005
Next time this happens look in the console log for relevant error messages.

You also might try a command-r boot to recovery and use Disk Utility from there to do a disk repair and see if any errors are found.

Also try running the Apple Hardware Test.

Do you still have your old drive? I would pop that back in and it would tell you if the new SSD is bad.


macrumors 65816
Original poster
Aug 17, 2007
okay...yeah i have run the hardware test a few times and it showed nothing wrong. i'll try the log next time it happens. i still have the old hdd and was thinking of swapping it out to check, but wanted to make sure it might not be something OS related before i did that. thank you!


macrumors 65816
Original poster
Aug 17, 2007
just an update...after a lot of troubleshooting, i have decided the problem exists while using Mountain Lion or Mavericks. so far i have zero issues while using Lion. what is causing it specifically shall remain a mystery i suppose.


macrumors 6502
Sep 24, 2013
This is just a theory but you may want to look at enabling Trim on your SSD (if it supports it) Not having TRIM enabled can cause a huge performance drop while write operations are happening which might explain a few of your issues
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