Acer aspire 5100 laptop won't boot

I have an acer aspire 5100 laptop that will not boot. Shows boot mgr is missing. The bad thing is it will not recognize the dvdrom or any usb drive. Have a usb cdrom. Bios appears to be corrupted because it did work when vista booted up before, but would not recognize it when selected to boot up in Bios settings. Any ideas on what i can do to get the bios back to factory settings.
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  1. Welcome to the forums!

    Remove the CMOS battery for 30 seconds or short the jumpers for 30 seconds.
    Also remove all power and battery when doing this.
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