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A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.
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Make sure the boot sequence in the System Configuration Utility is correct. For most troubleshooting, the boot sequence should be:
Diskette drive (if installed)
CD-ROM (if installed)
Hard disk drive 0
If any installed bootable device, such as the hard disk drive, is not shown in the list of devices to select from, that device was not recognized by the BIOS during the POST. This condition must be corrected. Proceed to the appropriate troubleshooting document.
Disable any boot to network setting to make sure the Preboot eXecution Environment (PXE) is not trying to boot. PXE enables remote booting and system access before the computer can boot to a local operating system. If using an optional network adapter, refer to the owners manual for directions on how to change configuration settings. Test the system to see if the problem is corrected, and continue to the next step if the problem is not corrected.
Refer to IBM Networking Support for information on network adapters.
Refer to the Hardware Maintenance Manual for directions on how to change the boot sequence.
the harware manual is a link, click on it