User Guide

Troubleshooting Symptom Charts/ Error Beeps - 22
Error Beeps
If you hear from one
to five error beeps at
startup
with no boot
chime
, you have a
hardware problem.
1 Do you hear one error beep at startup?
Yes : Follow these steps to resolve the problem:
- Reseat the SDRAM and try again
- If no SDRAM is present, install a known-good SDRAM SO-
DIMM in the top slot and try again.
- If DRAM is present, replace it (one DIMM at a time,
starting with the top DIMM slot) with a known-good
SDRAM SO-DIMM.
No : Go to next step.
2 Incompatible RAM is installed. Do you hear two error beeps
at startup?
Yes : Verify that only SDRAM SO-DIMMs are installed and not
EDO memory. (The iMac ships with SDRAM SO- DIMM memory
and is not compatible with EDO DIMMs.)
No : Go to next step.
3 Bad RAM. Do you hear three error beeps at startup?
Yes: Replace the existing SDRAM one DIMM at a time (starting
with the top DIMM slot) with known-good SDRAM SO-DIMMs.
No: Go to next step.
4 Bad ROM.
5 Do you hear four or five error beeps at startup?
Yes: Follow these steps to resolve the problem:
- Reseat the processor module and try again.
- Replace the processor module and try again.
- Replace the logic board.
No: If you do not hear any error beeps at startup, refer to one of
the other troubleshooting tables in this chapter.