What do I do if my MBP doesn't recognize my HDD after a hard reboot?

I have a MBP 13'' Mid 2010 2.4GHz 4GB. I work on Lion, with BootCamp and Parallels installed.
Two weeks ago, I used Parallels to open up Windows for the first time since months. I think, maybe for the first time since i migrated with TimeMachine from a Backup. Windows worked fine. In the end of my session, I put it to hibernate by just closing it. Later this day, I opened it again and the monitor froze. I made a hard reboot which resulted in the folder with the question mark. I thought "crashed hdd". I exchanged the hdd for a new one and started up SL Install from the DVD. SL Installer (more exactly: the Disk Utility) does not even recognize it as a HDD! I put a third HDD as external USB which was recognized and I installed SL there. Later, I even put my "crashed hdd" in an other case => works also, I can boot from it! But still as I write to you know, I work from a boot off an external hdd and the disk utility in SL does not recognize the internal hdd. The SuperDrive works fine. Apple Hardware Test did not give any results. PRAM-Reset was done. The laptop even still is stable under stress, calculation, gaming and everything.
Yesterday I used Windows again, now from the USB-Drive. It worked fine and I turned it off in the evening. Today, when I tried to boot from the HDD => Folder with question mark! Now it's working again as I'm home, and I'm not sure if this is because of 1) Luck 2) a PRAM-Reset 3) pushing Alt during the boot. I have to say: In this two weeks I didn't need to push Alt during boot for the Mac to recognize and boot from my USB-Hdd.
I'm afraid that my LogicBoard is slowly dying... can somebody explain me what happened?
Is it possible that BootCamp destroyed something of the hardware? Moreover, what more can I do to "reset" my MacBook to its original state, additionally to putting a new HDD in it? I think and hope that no hardware is damaged, so a total reset of all possible properties could probably help me. Will I have to flash the EFI? Is that even possible?
Thank you all very much for your help!
Greetings
Tobi
PS: At the moment I think of my laptop as of a patient having a heart transplant on a cardiopulmonary bypass: Everything works fine, but many important part happen outside of the real body!

Hello, Grandma Mo. 
Thank you for visiting Apple Support Communities.
I would first make sure all updates have been processed for the computer and iTunes.  You may need to place the device in recovery mode before iTunes will recognize the device.  Here is the article that explains that process.
If you can't update or restore your iOS device
http://support.apple.com/kb/ht1808
If the device is still not recognized by iTunes, see the steps in the two articles below.
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/ts1538
iOS: Device not recognized in iTunes for Mac OS X
http://support.apple.com/kb/ts1591
Cheers,
Jason H.

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