My 8gb kingston pen drive not detected in any computer, even it's led light doesn't blink.what can i do??

Check the little copper contacts in the USB connector and make sure there is no damage to them, or crud stuck in there that would prevent good electrical contact.

Next, be sure to fully insert the thumb drive all the way into the computer's USB slot. Make sure you hold the button in the extended position so the pen drive's USB connector does not retract at all when you try to push it in.

Make sure you have tried it in different computers and in different USB ports that you know to be functioning to confirm that it is not just a faulty USB port on the computer.

If the pen drive still does not get recognized in the MY COMPUTER list, then it is certainly possible that the drive itself is faulty. Kington drives are normally pretty reliable, but even they are not designed to last forever and they will fail occaisionally. It might just be time for a new one.

Good luck.

Then i must tell you that the pen drive is spoilt