iPhone Generation : 3GS
Unlocked? (or Part Number): Not sure how to check part number on my 3GS, but I bought mine from Maxis and from the Maxis thread it says that all iPhone sold by Maxis are unlocked.
Current Firmware : iOS 5
Current network: Maxis
iTunes Version : iTunes 10.5.0.142
PC/MAC : PC
Jailbreaking software : Not jailbroken
Problem Encountered : iPhone won't switch on. Had around 50% battery left, then I used my Griffin iTrip (http://www.griffintechnology.com/itrip) in my car to charge it. After reaching my destination I unplugged the iPhone and it was switched off and I cannot turn it on.
Steps Taken So Far : Already tried charging it, soft reset (power+home button simultaneously), recovery mode (hold home button while plugging to PC USB) and DFU mode. None worked
Screenshot of Problem(if applicable) :
Other Information/Remarks : I have a 24-month contract with Maxis, and I'm in 17th month now. Is my warranty still valid? Able to exchange for a new set? Doubt they still have stock of the 3GS though.

Went to Maxis centre, the guy checked and said that water got into my device. I did not drop it into water or anything, maybe a few drops of water could have splashed at my iphone. Because damage by water is not covered by Maxis warranty, Maxis can't do anything about it. Repair cost is RM1800, might as well get the 4S later. Anyone know if there's a fix to this problem? Like the dry rice solution for other phones?

Unfortunately an iPhone can't be dismantled without the proper tools, that's why I did not do it immediately.