Hi Tamour-
It sounds like either a faulty ROM or faulty hardware. You could try reloading the ROM using the SD card flash method detailed below.
http://www.aximsite.com/boards/showthread.php?p=957573
It is not an easy process but if you're technical you can do it. If that doesn't work you will have to contact Dell if it's still under warranty or consider it a loss if it's not.
-Mahstah