HP 6710b - Unusual Power Supply Glitch
Some time last year a staff member had a problem with his HP 6710b laptop. It just crawled to a standstill, and I spent hours trying to work out what was slowing it down. I reimaged it, ran it off a live cd, swapped out just about every piece of hardware from it and still it wouldn't do anything at a usable speed. After much tedium it was replaced with a brand new machine and I disassembled it and used it for spares, including the power supply which I had labelled some weeks earlier "Paddy McGinty's Goat" (as the staff member is Irish and it seemed rude not to have a joke about it).
On Friday a member of staff brought a 6710b to me which had apparently died. I pulled a power supply from the spares draw and it started straight away... didn't even log in, I knew I'd fixed it so powered it off and gave it back. I got a call two hours later to say that it wasn't letting her on the Internet. When I came to look at it I realised that the whole thing was running like a sloth. Completely baffled, I brought it back to the office and was about mid way through investigating when I noticed a label on the psu.
"Paddy McGinty's Goat".
I pulled out the power, the laptop switched to batteries and... suddenly it all came back to life. We're all a bit surprised that a psu could have that effect, but most of all it's amusing that the one clue that led me to the solution was my stupid prank from when we first gave our Irish friend his laptop!
I am a little bummed that we scrapped a perfectly good machine because of the power supply though :(