Editing Atari Portfolio Troubleshooting Guide (section)

=== Unit Does Not Power On ===

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|+ Power-On Failure Diagnosis
|-
! Symptom !! Likely Cause !! Action
|-
| No response at all || Dead batteries or corroded contacts || Replace batteries; clean contacts with IPA. Check for battery leakage damage.
|-
| No response with fresh batteries || Power ribbon cable disconnected || Open unit and reseat the flat ribbon cable between keyboard PCB and display PCB. This cable is fragile and frequently comes loose after disassembly.
|-
| No response with AC adapter || Faulty adapter or damaged DC jack || Test adapter output voltage — should be approximately '''6V DC''' (centre positive). Inspect the DC jack solder joints on the PCB.
|-
| Brief flash then nothing || Shorted component or failed capacitor || Check for visible damage on PCB. See [[Atari Portfolio Capacitor Replacement Guide]].
|}