IBM 2274 - Manual (Page 114)

80 IBM Desktop System HMM
4. If no keyboard keys are pressed, and if POST is
completed without errors, the system will then
proceed with the loading of Windows98 or other
operating system from a hard disk drive or diskette
drive A or CD-ROM drive, depending on the Start
options selected in the Configuration/Setup Utility.
If any errors are detected by POST, there will be
an error message accompanied with an error code
shown on display screen and a beep. See “Index
of Symptoms, Messages, Error Codes, or Beeps”
on page 38 to find the most likely cause and
countermeasure.