First ESR test all capacitors on the Analog board. It's possible there are bad one's.

For the voltage, adjust the variable resistor PP1 on the analog board. It is small and can be found at about the center of the board. Clockwise will increase output voltages. Be careful, it is sensitive. Only use this if bad elements have been repaired/replaced on the board, otherwise you risk damaging the machine.

Probably your hard drive is suffering from stiction of the heads and so draws too much power from the PSU.

What are the voltages with the hard drive uplugged ?

Take Care,

Nico