If the dvd drive is making funny noises then the disk might be scratched or the drive is only a 2x (speed) drive and your disk is 16x (speed) and it is having problems reading the DVD disk.
The Dell inspiron 1420 (Vostro) laptop, driver updates are available for Removable Storage such as the DVD drive - http://www.dell.com/support/drivers/us/en/19/Product/inspiron-1420
Scratched disks dont make more noise.
2x drive with 16x disk? Thats all crap the speeds dont matter, if a drive is 2x its only going to read at 2x its not going to make more noise then any other disk.