I can't remember, but is the CPU on a seperate board. The PB 14x/170 has a seperate board that sits above the logic board that holds the CPU, RAM and the ROM. Is this the same setup on the PB 165?
I would try (if you can) cleaning the contacts on it, and reseating the whole board. Also, check for broken traces, and in some case, you may actually have a bad power section. You might have to source the bottom board. Especially if you are having issues getting it to turn on from the power button (which is on the back, right?) which indicates component failure.
Is there a RAM module in it? Take it out. see if that fixes it. It could possibly be a bad/shorted RAM module, causing issues. Then the other things to try is disconnect the hard drive and floppy and try starting it. Remember the hard drive pulls a lot of power, which can rob the system of power when it sucks all the power if it's defective.
I would try (if you can) cleaning the contacts on it, and reseating the whole board. Also, check for broken traces, and in some case, you may actually have a bad power section. You might have to source the bottom board. Especially if you are having issues getting it to turn on from the power button (which is on the back, right?) which indicates component failure.
Is there a RAM module in it? Take it out. see if that fixes it. It could possibly be a bad/shorted RAM module, causing issues. Then the other things to try is disconnect the hard drive and floppy and try starting it. Remember the hard drive pulls a lot of power, which can rob the system of power when it sucks all the power if it's defective.