New SSD will not boot internally, only from USB.

Just chiming in. I have to agree with Clinton. I've helped several people on here with this same issue when upgrading to an SSD, and the SATA cable has been the culprit. I've been running a Crucial flawlessly for 2 years on a 2010 model. As for the optical bay, a Superdrive is MUCH slower with data transfer, so it may not show the problem.

Thanks for the info.

In my case, even booting externaly from my SSD doesn't work. (Though I get to the grey screen and the cursor appears)

I'm starting to guess it's the drive itself.

If you can't boot externally with a known good enclosure, then yes... the drive is the likely suspect.

I'm now installing a fresh system, will look into the reported firmware issues (it's a Crucial) and will report back here.

Clean install solved it.

I have the same problem as the initator of this thread.

- 2012 Macbook Pro intel i5

- Recently upgraded to OS X Mavericks

- Crucial SSD drive runs fine externally, but once plugged in interally I receive the folder/question mark icon

After posting multiple times on the crucial site and receiving arguably the worst customer support ever, I've decided I will never again buy a crucial product.

I don't have a solution but I know why so many people are running into problems. Apparently the m500 drive (or its firmware) isn't compatible with apple's new OS update. This is the reason for the "no disk" icon when installing the newly cloned crucial drive internally.

Yes, I can transfer all of my files/applications to the SSD if i run a fresh OS install on the SSD, but I don't want to do that.... I'm very picky about my itunes library, and specifically the "Date Added" sort category. I certainly want to retain these id3 tags, but p2p transfering causes the file to lose this information. This is why I want to use (and have been using) carbon copy cloner.

The probelm will be solved if either a) Crucial addresses the problem and rereleases a new firmware or b) Apple updates Mavericks so it is compatible with Crucial's drives

If it works externally and not internally, it's the SATA cable.

I had the same problem, but I swapped the drives before cloning using Disk Utility on my second try. My original HDD was plugged in through USB with the new SSD installed internally. That worked like a charm. You will probably need to hold down the Option key on the first startup following the cloning though and select the SSD. After that, it boots automatically to the SSD. I hope this helps everyone else.

But if the problem is the SATA cable why would my Apple HDD work fine when connected internally? It's only the SSD that doesn't work internally.

Because the SSD is a lot more demanding on the cable than an HD. It's carrying a lot more data than the HD, so a marginal cable is going to cause problems. Search these forums, this happens all the time and a new cable resolves the problem. It makes no sense that it would be a Crucial problem. You've already proven the drive works.

I'll give it a shot.

Just because the drive boots externally doesn't necessarily exclude crucial from my error elimination list.

I used Carbon Copy today when I cloned by Crucial Drive. It booted fine on my external in closed drive. However, tonight I have the flashing folder.

Based on what I read I would think the cable needs to be replaced?

Sounds like it, yes.

I fixit has a used one for $50. I found the same one on Amazon for $30 new. Why shouldn't I buy the new one?

You should. Ifixit doesn't always have the best prices, but it's a great place to find the part numbers. If you're sure it's the same part, but it from Amazon.