Tips for Troubleshooting Common Computer Problems I can't see anything on my computer screen. The picture does not appear. The screen is not synchronized. The position of the screen is not in the center. The screen is too bright or too dark. The screen is shaking. My computer is on, but it is frozen. My cursor is stuck on the hourglass and won't let me do anything. Delete all files with .tmp extension. Clean temp directory. Delete old .zip files. Computer won't start. Keyboard doesn't respond. Mouse problems. An unresponsive PC. Computer will not connect to the Internet. Why to restart your computer. Have you checked your PC cards? Does removing the hardware clear up the trouble? Where are you booting from? Error messages. Cleaning out your hard drive. Deleting unnecessary files. Printer problems. Fax machine errors. Non-system disk or disk error. Windows was not properly shut down. Out of memory. This program has performed an illegal operation and will be shut down. A file being copied is older than the file currently on your computer. Boot disk failure or operating system not found. Can't find boot record. Missing shortcut: Windows is searching for XX. Error reading CD_ROM in drive X. DLL is invalid or corrupt. Error copying file....Cannot copy XX: The disk is write-protected. Remove the write protection or use another disk. No sound is heard from audio (music) CDs. Check the following. How do I locate a lost document?