IBM Aptiva Handbook page 116

Step 2
Did the system beep after it was turned on?
The system has passed the power-on self test (POST). Go to Step 3.
Yes, once
Yes, more than once
There is a problem with the tower. Find the code displayed on your screen in
"Responding to error codes" on page 123 and take the action listed.
No
There is a hardware problem. If you added hardware, remove it and restart the
computer to see if the problem is corrected. If the problem is corrected, you may
have installed your hardware incorrectly. Reinstall your hardware.
For instructions on installing hardware in your tower, see "Chapter 7: Working
with adapter cards and drives" on page 77. For instructions on installing hardware
on your system board, see "Chapter 6: Working with system board components"
on page 63.
If the problem continues, see the HelpWare book for information on obtaining
service.
100 Chapter 8: Diagnosing and recovering from problems