Editing Macintosh IIsi Troubleshooting (section)

== Startup Failures ==

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|+ '''Startup and Boot Problems'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| No startup chime, gray screen || RAM failure, ROM failure, capacitor damage || Reseat RAM SIMMs; check for capacitor leakage; test with minimal RAM config
|-
| Startup chime but no video || Video circuit failure, bad monitor connection || Check video cable; try different monitor; verify video port pins
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| Sad Mac error code || Hardware failure (RAM, ROM, or logic) || Decode error code (see below); test RAM; reseat ROM
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| Flashing question mark || No bootable drive found || Check SCSI drive; verify SCSI termination; test with boot floppy
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| Frozen gray screen || SCSI bus conflict, bad SCSI device || Disconnect all SCSI devices; check termination; verify SCSI ID settings
|}