Macbook Pro (2011 Model) suddenly does not boot from SSD in main bay

I have been using Macbook pro 2011 and Samsung SSD (256GB) for about a year.
All of sudden, the computer will not from SSD from the main bay, but it will boot from the optical bay.
I have tried an Intel SSD 120gb which came with the computer, but it does not work either.
However, it will boot from the regualr hard drive from the main bay.
I have read somewhere that it could be due to the hard drive flex cable.
Has anyone experienced a similar problem?

It may very well be a problem with the SATA cable... for some reason (and I don't know why, but...) SSDs seem more prone in 'detecting' a faulty SATA cable than a standard hard drive. Where a hard drive will boot, an SSD will not.
I would advise purchasing a new SATA cable - from ifixit.com or powerbookmedic.com - and replacing the cable. That (normally) clears up the problem.
Clinton

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