My fit bit will not come on and when I plug it into my computer to charge all it does is vibrate and make a noise but nothing else happens.

you wear it on your wrist after you charge it up via the usb charger.

You download fitbit app on your phone and then add fit bit to phone .

I am not sure how it works I am guessing it has a motion detector in it and each step causes a vibration it detects.
It must have some sort of a pulse sensor as it also knows when you are a sleep .
you need to set up an account using an email address with fitbit via the app.
there is also a windows app but you need the fit bit dongle that comes in the box it came with plugged into the usb port of p.c.
even thoug pc has bluetooth it does not seem to work with the p.c application unless the dongle is used with it.

Buy an android phone............

open the hard disk casing remove the drive check it on some other casing

check the drive shaft "U" joints and slip joint for bad wear . If you have a centre bearing check it for serviceability. pull the plug in the diff and check the magnet for metal bits.

Try holding the power button in for about 15 - 20 seconds to see if it comes on, do this whilst plugged into a computer or your car.

go to applications, utility folder, disk utility
then format the drive in any other way besides
dos.

I PLUGGED IN MY MP3 PLAYER TO THE COMPUTER AND THE SCREEN ON MY MP3 PLAYER LIGHTS UP BUT the normal screen image for when you normally plug it into the computer ISN'T THERE AND I CAN'T ADD MUSIC ON MY MP3 PLAYER.

you can check the wheels make sure there on tight and make sure you tie rods and wheel bearings are good

The description is a bit vague, but check that all the brake pads have the vibration plate between the pad and the piston. If one or more of the plates is missing it can cause the pad to vibrate under braking. Whilst you are checking make sure that all the calipers are tight on the the mounting bolts.

All I did was wait for it to come back. I think it might have had something to do with the battery being low. However, that's never happened to me when the battery was low. When I plugged my charger in, I got a text message. I had the ring on high and vibrate. It vibrated for a second, then it just continued to ring. Once my phone was fully charged, the vibration came back. I think it was just a glitch in the phone. Razr's suck.