When I plug in my mp3 it will come up on my computer screen

The LCD screen "might" be loose. It might need servicing. But first, try removing the battery and then replace it back and see if that will fix it.

Does you computer detect a new device when you plugged the Coby MP3 player?
If Coby MP3 player has cd driver, better to install it to your pc. Some computer/laptop doesn't detect autoplay when new USB device plug-in

please replace mp3 player cable port

when i plug it in to my computer it just shows the screen on the mp3 player as writing

When the mp3 player is plugged in to the computer, it won't respond to anything except the computer- the screen will just sit there and say it's connected. After you unplug it, it probably doesn't respond for 3 seceonds because it's refreshing its media. It might tell you it's refreshing or just refresh without saying anything.

you should try to reset your sansa

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.

The most common cause is a flat battery. There is a trick to charging

the battery in these small mp3 players. It wont charge if it is turned

on, and it won't charges if it's in sleep mode (zzzz). Here what to do...
1. plug the payer into your USB port. or wall charger
2. switch thje player on
3. turn it off by either holding down the play button, or selecting

"System" from the menu
4. The screen will go black and the battery will begin charging.

It will turn on but freezes at the opening screen. Cannot access the menu whatsoever. I've tried plugging it into USB in the back, removing the battery, sliding the Hold button to the right as advised in forum suggestions but nothing budges it from the opening screen. Also: it does not show up as being attached to any computer I plug it into. Got a fix?

It could be the usb cable,so shop around for another usb cable for it, if that doesn't work take it (The mp3 player) back to best buy and tell/show them what happened.