Troubleshooting Power-On Self Test/ - 18
Power-On Self Test
There is a power-on self test that resides in the ROM of the iMac.
This test automatically runs whenever the iMac is powered on
after being fully shut down (the power-on self test does not run if
the machine is only restarted).
If a problem is detected during the test, you will not hear a
normal startup chime. Instead, the system will beep as explained
below. Refer to “Error Beeps” later in this chapter for
instructions on how to troubleshoot and repair an iMac that sounds
error beeps at startup time.
Following is a definition of what the error beeps at startup time
signify.
1 Beep:
No RAM is installed or detected.
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