I have a Dell Inspiron 1420 laptop. I left it running overnight and when I checked in the morning the screen was moving up and down. I tried playing videos in full screen and it does, too. It seems as if the screen was bouncing even though the laptop is still booting up. Please help.

Hello try to renew the display driver from here:

http://www.dell.com/support/drivers/us/en/ussoho1/Product/inspiron-1420

If the driver does not help the screen must be renewed.

This will cost approx 200 dollars.

Good luck

Try to change the resolution of your computer to lower, restart the computer and see if the problem still exist. if the problem still exist try to reinstall the video driver of your computer. don't rewrite the driver of the video device, uninstall the driver then install again. if any thing happens feel to reply. TY

CLC

Go back into Safe Mode, and try to run a system restore to a date where this issue did not exist.

Try putting in a new battery.

Have you tried to uninstall the webcam, or to restore your computer to an earlier date? Would verify that the webcam software may be a problem.

you need to enter setup by tapping one of the f keys or the delete key. i'm not sure which it is for this model. when you enter the bios setup change the boot order to boot to the dvd first. hit f10 and save the change then reboot with your install disk in the drive. it should start installing.

Try connecting an external set of speakers or headphones, see if you get both channels, if you do, then the speaker assy is bad and needs replacement.

If you only get audio on 1 channel externally, then check all the sound settings in Control Panel (make sure correct speakers are selected and the playback settings are all correct.)

Sounds like your graphics adapter isn't working correctly or there's a problem with something in Windows (I'm assuming you're running Windows XP). If so, restart your computer and hit F8 until you get a menu. Select Safe Mode and see if it boots up correctly. If it does, note any error messages you may receive and then shut it down. After shutting it down, let it start up on it's own and see if you get your picture back.

check processor fan and use extra portable laptop fan.

The fan could be faulty (ie stopped spinning) or the heatsing vents are clogged with dust.
Remove the fan and check/clean the vents/fan. If the fan is faulty replace it.