Firstly, I hope you dont mind this PM but i was reading your post with interest on the use of a bench psu to troubleshoot a motherboard and Leakseeker.

I have a Dell Studio 1558 which i cannot find a schematic for. When I plug the Dell DC cable into board the Blue LED on tip of cable goes out imediately. Removing / replacing PSU from / to mains LED returns? I therefore I assume I am looking for a short? and according to your goodself, the best tool for this is a bench PSU?

Where though do I start?

Thank you in anticipation for any advice

Keroan