Keyboard locked in Caps

Question

Hi all,
I have a small problem on my MBA (Late 2010) which is kind of annoying. Sometime, the keyboard decides to lock itself in Caps, and this without pressing on the shift or caps lock keys. In the middle of a sentence, if will decide to lock itself and that sometimes stays for a long time. Try to restart it when it does that, and it will boot in safe mode (as when you press shift during the starting process), minimze app and it will do that in slow motion, as when you press Shift. Not sure it is hardware as it does it without pressing the Caps keys at all.
It just appeared after upgrading to 10.6.7... not sure it is releted?
Any idea (I am not going to be near an Apple store and maintenance Center for a month at least).
thx

Answer 1

Thanks again for your replies. In fact, the USB keyboard is not and cannot be the problem, not sure I was very clear before. I used to use my MBA only with its own keyboard (no external keyboard plugged). Since I bought it, late december, I had absolutely no problem, but after doing the 10.6.7 update (and I am not saying that there is a relationship), I started having this problem of the Caps (SHIFT key) being locked. This is not all the time, but most of the time. For example today, it worked fine for 5 ours, and then in the middle of the afternoon, the keyboard locked itself in Caps (however, yesterday it was locked the whole day in Caps).
The consequences, despite the fact that I write with caps, are that:
1) minimizing any windows will be done in slow motion as if you press the SHIFT when doing so
2) when I restart the computer it will start in Safe boot mode as if SHIFT was pressed during start up.
3) I cannot select one file, email or folder, but it will select everything from the beginning to the one I clicked on, as if SHIFT was pressed when you select a file, mail or folder.
The only way I am able to use normally my MBA at the moment is by plugging a USB keyboard to it (and I only have a PC one, but this is not an issue). So the USB keyboard is not the cause, but a temporary (I hope) solution to my problem. I am sorry for not being clear enough in my previous post.
I did run a hardware test, I did run the disk utility, did the resets... but still the same problem is happening. I created the Test account, and same thing, when it is locking itself, I will have Caps only on both accounts, as well as on Windows 7 running under Parallels 6.
It is a pity because I love my MBA, which is my first Mac experience... Really annoying though when you are in a small country with no Apple reseller or maintenance center.