How many Volts did it read?
As to the motherboard, this is where service centers have it all over us. They can swap in a board and not take the wallet shrinkage.
When I press the power switch, the switch lights up, the fan wooshes, and I hear some clicking, but screen is black.
I've tried unplugging it and holding down the power switch, and then restarting. That worked a couple of times, but no more.
I tried the F5, F10 routine, and that didn't work.
I took the back off, and reset the RAM cards, and checked the battery, and no go.
I think this is a fairly common problem, and I've heard that it might be the motherboard, but I don't just want to buy a motherboard without knowing what the exact problem is.
I plan on contacting HP Support later, but in the mean time, does anybody know any further diagnostics to help me narrow down the problem? Thanks in advance. Ed