when i turned on my guitar amp, it gave out a very loud sound..(like explosion sound) .then, it doesnt work anymore..it is like no electricity going through it...how to fix dis prob ? is my amp spoil ?

What brand my friend? You can bring back to the dealer to have them check it out.

You also can remove the back cover and see if anything is broken (PCB, etc) -- a burning smell is also a good indicator something got fried. Make sure you remove the AC before doing that though!

What amp are you using?
did you import it from the US? If you did and didn't convert it's power supply to Malaysian power, congratulations, you just blew up your amplifier.
Also, if it's a tube amp, it could be your tubes.

i sent to the music shop 2day...the man says its the fuse prob n he replaced a new 1 . then everything's fine now..anyway thx guys ^^ btw i m using smarvo amp.