Try going into your BIOS and setting the BIOS defaults. You can do this by powering the system down completely, and turning it back on, and pressing F2 when you see the Acer screen. Press F9 to reload setup defaults, then F10 to save and exit. If that does not resolve your issue, you may need to reload your operating system. If you need recovery disks, you can order them at http://store.acer.com. If reloading your operating system does not resolve your issue, you may have a problem with your hard drive. If this is the case, please contact Acer Technical Support for your region.