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1. Check for a floppy disk in drive.
2. If it isn't the floppy check BIOS boot order
3. If it isn't any of those I'd suspect that it could be a bad hard drive. Try starting the system up with some type of start up disk.
The simple thing would be to replace the BIOS (motherboard) battery. When the battery is bad it will not save the BIOS settings reliable. The battery is about $4 and is located on the motherboard next to the processor. In the image you can see the battery (labeled "M") in the picture of the motherboard.