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BIOS : Basic Input Output System Problems

Sometimes, improper BIOS settings can result in a conflict between AGP and PCI graphics cards. To make sure your BIOS is properly configured, restart your PC and immediately begin pressing the designated key that grants you access to the BIOS. This key varies from system to system, so check your computer or motherboard manual for information about which key to press. You may also see instructions for accessing the BIOS appear on-screen as WHAT TO DO WHEN . . . 
You’re Having Video Problems When you see this pop-up, click No to launch System Restore from Safe Mode. the computer boots. 
Some common keys are DELETE, ESC, F1, or F2. If you’re required to press a function key, make sure you don’t have F-LOCK enabled on your keyboard. Press the key repeatedly until you enter the BIOS. Changing BIOS settings can cause your computer to fail to boot, so exercise caution. If you’re using an AGP or PCI graphics card, make sure the BIOS is configured to initialize the display with whichever type of card you use. Some older PCs are set by default to recognize PCI graphics cards before AGP graphics cards. Examine the BIOS menus for an option that lets you change this to the appropriate setting for your graphics card. Individual menu and options names vary greatly by PC, so consult the documentation that came with your computer or motherboard. Once you’ve changed the settings, press the Save And Exit key, typically F10. If at any point you made a change to the BIOS that you want to undo, you can reset the BIOS by pressing the designated Load Defaults key. The Save And Exit and Load Defaults keys usually appear on the main BIOS options screen.