philips dvd/hdd recorder

[daz]

hello
got a dvdr7250h in for repair, fault is it trys to startup with starting on the display but the hard drive just pulses as the voltages from the psu are dipping, warming the psu just the right amount will get the unit to work but too much and you get nothing and freeze it and you get nothing, did find several caps with high esr but it made no difference to fault.swopped hdd still the same.
any ideas ???
its driving me nuts and costing a fortune in freezit
thanks
daz