my ipod wont turn on!! even when plugged into the computer ... HELP

i exprienced the same problem with my ipod touch, i thought it was knackered. try this

lay it flat on the table face up, press the on/off button located on the end & the button located on the screen at the same time hold for a few seconds and you should see the apple symbol appear on the face. you should be able then to press the button on the screen to access your tunes etc.

Then see if placing the iPod in recovery mode will allow iTunes to see the iPod so you can restore the iPod. For recovery mode see:

iPhone and iPod touch: Unable to update or restore