Garmin c330 the bottom half of the screen is blank

yes the battery needs to be replaced, even when the GPS has external power the battery must be good for it to work,

Yes, you can replace the battery. Please view video at link; http://www.videojug.com/film/how-to-replace-your-garmin-street-pilot-c330-battery-2
And also see link to purchase battery.
http://www.newpower99.com/Battery_for_Garmin_StreetPilot_c330_p/garmin%20streetpilot%20c330.htm
Please let me know if it helps.
Thanks

Since I didn't hear from anyone, I contacted the co. I purchased from. I was advised to send it back.

IT'S CALLED A FROZEN SCREEN...

2 OPTIONS

ONE, RESET IT !!! (See resetting instructions below)

TWO, let the battery die out!

Waking up your c330...

If you left your Garmin c330 on running the battery will have 1% life left. If you turn c330 back on again, it will flash screen for 3 seconds then die, even charging it at this point will not wake it back up. TO BRING IT BACK TO LIFE... plug in the power home or car into Garmin c330. There is a tab in the front Garmin gray frame of your screen. You must take like your fingernails and under the logo "GARMIN" pull the whole gray plastic frame off. Underneath the plastic frame to the right hand side. There is a "RESET" button. Make sure power is plugged in while hitting reset. Your battery should come back to life. Cheers

The silver faceplate snaps off (there is a tab at the top of the screen); remove the silver faceplate, remove the 4 screws to open the unit. The battery is located on the back half, and is conected to the circuit cards with a balck and red wire through a small connector that also as two brown and white wires for the speakers.

It took a nap...

Waking up your c330...

If you left your Garmin c330 on running the battery will have 1% life left. If you turn c330 back on again, it will flash screen for 3 seconds then die, even charging it at this point will not wake it back up. TO BRING IT BACK TO LIFE... plug in the power home or car into Garmin c330. There is a tab in the front Garmin gray frame of your screen. You must take like your fingernails and under the logo "GARMIN" pull the whole gray plastic frame off. Underneath the plastic frame to the right hand side. There is a "RESET" button. Make sure power is plugged in while hitting reset. Your battery should come back to life. Cheers

IS the battery charged fully? Try turning it on while its plugged in.

This doesn't fix Sitfar's problem, but for those how might find this helpful from Garmin's site: Question:  The touch screen is not responding correctly when I touch it. How can I recalibrate the screen?
Answer: To recalibrate the touch screen:

1. Turn the unit off.
2. With the unit off, touch and hold the Power button for 30 - 40 seconds.
3. Follow the instructions on the screen.

put your thumbnail under the silver faceplate above where it says garmin and on the right you will see a reset button. It will reset your garmin and you will not lose your information. Hope this helps.
Patti

Have you tried a Master Reset? If not, it may help, but it WILL ERASE ALL OF YOUR FAVORITES, and may remove anything you have updated. To do a Master Reset, turn the unit off. Press the On button and the bottom right of the screen at the same time. Release the On button, but keep pressing the screen until the unit asks if you are sure you want to reset. Press yes. This may help.