I've tried the SMC reset and it didn't work.
I found out that my 2 years old battery kinda died.
So I bought another one, SMC reset it again and testing it now.
Currently when I have the battery on, the fan is just working so hard.
While if I don't have the battery on, it's running silently.
I guess the power management is a bit off.
I'm trying to do Apple Hardware Test, but since I've upgraded to Lion, this function doesn't work.
Tried with the CD as well, but I think my CD slot is busted, it doesn't seem to read properly.
Any idea on how I can get AHT other than the installation CD?
Thanks for your help btw!
You ought to be able to invoke Apple Hardware Test by holding the D key while starting your computer. This should load AHT from your recovery partition that was created when you upgraded to Lion.
If that does not work, hold Option D instead. That will attempt to load an Internet based version of AHT.
That means the disk based copy of AHT was not installed on the recovery partition. I don't know if this was intentional on Apple's part or not.
You can install AHT from your original system installation disc by extracting it with Pacifist. Find your original system installation DVD which may have been Leopard or Snow Leopard. The disc will have "AHT version xxx" printed on it.
On that disc find the CPUHelpFiles package and extract the file called CPU_AHT. Pacifist will install it in the location /System/Library/CoreServices/
Pacifist is shareware - download it here http://www.charlessoft.com/