It sounds like the power supply has failed. A good idea would be to check all components in this section, in particular the IC regulators, as well as diodes and capacitors for leakage and/or short circuits. Look for bad solder joints, burnt spots around parts, swollen capacitors etc. The ICs in this series (especially those in the power area) are known to cause trouble, so check those first. Also check resistors (fusible, high wattage (usually white block types) and normal colour-banded types) to see if any are open circuit or have gone high (resistors don't usually short circuit - they either go open circuit or change their value).
To ensure long-term reliability, it is a good idea to replace ALL of the electrolytic capacitors in any power supply as well as any blown/open/short-circuit parts. Capacitors are the most likely culprits for problems, so when replacing them, uprate their working voltages and/or values where necessary. If none of this restores your machine to full operation, take it to a service centre and seek a second opinion on this matter.
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