SATA Problem: Can see hard disks in USB enclosures, but not internal

I have a mid-2010 macbook pro 13". The other day, it crashed on wake-up, and would not boot. I had a OCZ Vertex SSD boot drive, and the OEM hard drive in an optibay enclosure (replaces the optical drive and used only for data). I used this setup for one year with no problems. After much troubleshooting, I found that I could see the SSD drive by booting into a recovery partition that I have on a USB stick, and putting the SSD in a USB enclosure. Then disk utility could see it, but not mount it. The label on the boot partition was "lion", but it changed to "disk1s2". I was able to repair the drive using disk utility, and then boot from it using the USB enclosure.
Once booted, I could still see the OEM hard drive with no problems. So I powered down and put the SSD back inside the case and rebooted. It booted in safe mode, but it booted fine. The next time I rebooted, it would not boot. I swapped the OEM drive and the SSD drive, and then the sytem booted with no problems and I was able to use both drives.
One day later, I noticed my OEM drive was no longer mounted in OSX. I took it out, put it in a USB enclosure, and OSX could see it fine. There were no errors on the disk. I put it back in the macbook and reboot but OSX couldn't see it.
So, the primary SATA port seems to be working intermittently. Three times now, a drive has stopped working on this port. Each time, I could use the drive in an external enclosure (or using the other SATA port normally used for the optical drive. Does anyone have any ideas? Could it just be the cable? It is the motherboard?
I'm trying to make this computer last at least another month or so because I need to upgrade to a larger model, and am holding out for the 2012 release.

Could be something as simple as the cable...they have been known to go bad. Got an Apple store nearby? If so, it's a cheap/easy replacement.

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