Replaced Hard drive w/ SSD, now it won't start up!

I just replaced my 15" 2008 MacBook Pro core 2 Duo (200GB) hard drive with a (500GB) Samsung 840 series SSD.

I did all the data migration, and followed the iFixit manuals.

It started up fine once, so I shut it down to reconnect my printer and an external hard drive i use for backups. Now, I get as far as the gray apple screen, and then a super-quick flash of a progress bar before it shuts down again.

Putting the old hard drive back in fixes it, but that hard drive is on it's way out and I was hoping to replace it before it goes.

Any advice is greatly appreciated.

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Try booting with no peripherals - do a safe boot, if that doesn't work try to enter AHT (hold down the D key).

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Okay, I ran Disk Utilities on the new SSD, and it seemed that all the data on it had been corrupted.

I initialized it again, and did the data migration over.

Seems to work fine now.

New SSD is up and running beautifully.

Thanks for the quick response machead3.


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Does this SSD of Samsung 840 give beachballls on your macbook? (I have a model A1226 2,4ghz MBP and it does give problems on boot) Although mine is from vertex 3 OCZ...

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sotocolor will be eternally grateful.
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