IBM Aptiva Hardware Handbook page 56

Step 2
Did the system unit beep after it was turned on?
Yes, more than once
44 Problem solving steps
Yes, once
The system unit has passed the power-on self test (POST). Go to Step 3.
There is a problem with the system unit. Find the code in "Error codes,
descriptions, and corrective actions" on page 60, and take the action listed.
There is a hardware problem.
No
a. 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 desktop system unit, see page 87. For instructions on
installing hardware in your minitower system unit, see page 107. For
instructions on installing options on your system board, see "Working with
your system board" on page 125.
b. Check that memory modules are installed correctly. For instructions, see
"Working with your system board" on page 125.
If the problem continues, check your A Guide to HelpWare and All the Extras folder
for information on obtaining service.