My macbook is two and half year old, going to sleep mode randomly

Having used this Macbook for almost two and half years, my machine has suddenly generated the problem of going to random sleep. It started as an infrequent thing, then it started happening on a regular basis, to the point that it became almost impossible to work with it. When the computer goes to sleep mode, it doesn't wake up with any key, it has to be woken up by pressing the power button lightly.
Here are the steps I took:
1. The normal thing I did was search Apple Forum and then reset SMC, PRam, then changed energy saving options, everything. Nothing worked.
2. Ran the hardware test and no problems found.
3. Ran the Macbook with all options: with just the battery, without the Magsafe connected, with Battery and Magsafe connected together, with battery removed and the computer running on Magsafe only. Random Sleep continues
4. Thought must be a connection issue and ran to Apple Store in Kolkata, India, thinking that it could be a connection issue with the sleep-mode cable. Apple Store kept the Macbook for seven days, saying that they needed to check the machine, returned it on the seventh day saying that the machine was fine and charged me Indian Rupee 1,500/- (about $ 34). I came back home and the problem persists.
(Here I would like to add that Apple Service in Kolkata *****, probably ***** all over India, simply because Apple is not a major player in this country. The service engineer at Apple Store was at a loss with my problem and after seven days could only say, "We have done our internal tests and found no problem with your Macbook." When I asked about the Sleep Mode sensor connection, he said, "That is working fine, we have checked that.")
5. After coming back home, I faced the same problem, this time with lesser time gap. It would go off to sleep every one minute or so. I decided to set my computer on "never to sleep mode" in the enery saving option. Alas, that didn't help either.
6. I redid the hardware check, only to find that my computer hasn't detected any hardware problem.
7. Now, as a previous Windows user, I thought that the problem must have been with the OS. So, at the risk of losing all my files, I decided to reload the OS. (My original OS DVD was Leopard, but it was later upgraded to Snow Leopard by the vendor free of cost). I took backup in Time Machine, and backed up the documents in another Disk and reloaded the OS. All seemed fine so far, for about 10 minutes. I was now confident that finally I could solve the problem and was then planning to migrate my previous files to my newly loaded OS-X. Alas, I was wrong. Before I could connect the external HDD to my computer, my Macbook went back to its previous trick of falling asleep.
I'll definitely take back my Macbook to Apple Care tomorrow, but with my experience here in Kolkata, don't know whether they would be able to solve anything. Last time I had to show them the posts in Apple Forum to prove that Random Sleep is a problem that happens to Macbook.
PS: My Macbook is with aluminium body bought in January 2009. Out of warranty. My optical drive conked off long ago (after about 15 months or so after I bought the Macbook) and I live with an external drive.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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