Sony ps x65 when started no sound except very intermittantly tried two different amps any ideas

The most obvious cause could be loose conections to the cartridge. Or even the cartridge itself. If you disconnect the wires to the cartridge and touch them with your fingers (turrntable connected to amp & powered up) you should get a buzz on each channel. If you don't the problem is not the cartridge, but a failure of the wires either inside the turntable or to the amp.