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same problem i slove ... 1st of all remove ram and turn and wait 20 second .. return the ram on by one .... may b one ram has problem .. if same then open ur laptop remove battery cell for 1 min and keep laptop off .. after one min return cell and dont close laptop just check open is work then close .. if not change thek crystal wich is near the winbond ic... near the keyboard conector.. hope it will be okie .. Thanks
Dell Laptop with bios or hard drive password set ? Unlock your dell laptop using the link below if it display a message that says "this computer system is protected by a password authentication system, you cannot access the data on this computer without the primary or administrator password, when you turn on the computer. This message is what you get if the BIOS is protected by a password. or you get system disabled
If Administrator is the username, the password should be blank or none. (leave it blank) just click on Ok and it will go straight to the option of System Restore, Complete PC restore, Dell factory image restore. etc.. Hope this helps
What operating system are you running on your dell 1521 laptop? What drivers are supported on your Dell 720 printer?
If you are running Windows Vista on your laptop and there are only drivers for your printer up until Windows XP and nothing is on Dell's website for your printer in terms of drivers, then you can only try to run Windows Vista in Compatibility Mode.
If this doesn't work, then you'll need to get a new printer.