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Re: Troubleshooting a hardware issue on a Ti/800
The Power-on self-test (POST) is a test in the BootROM Firmware that checks the Mac's hardware and RAM when the computer is first turned on and before any OS information is loaded. This test is only performed on a clean start-up, ie after a shutdown, not after a reboot. If there are problems detected, it will ring out "tones" to let technicians know what it has found. One ring means there is no RAM installed/detected. Two beeps means there is incompatible RAM installed. Three beeps means that there was RAM detected, but errors were found testing the RAM. Four beeps means a bad checksum for the BootROM (checksum refers to a value given to the correct orientation of data, and is a numerical expression "correct" data). And five beeps means that the boot block in the ROM is bad. |
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