My HP laptop has recently gone dead on me. No response from the power button at all. What is odd is that the power supply light is brightly lit when plugged into the wall, but once it is connected to the computer, the light begins to flash at a very dim level. It seems like some sort of short, hopefully something just where the power input is in the laptop. When the cord is wiggled a bit, it also sounds like a somehting is loose and sitting incorrectly just inside the computer
I actually solved my problem a while ago. I too thought it was the power supply, and took it to Best Buy, where for free they just plugged in a different power supply with no change to the computer. That left the internal connection, so I opened the case (which was quite easy to do) and the place where the power cord connects to the motherboard has a small silver housing. I just kinda wiggled mine around until the light of the power supply came on again, and put it all back together. No problems since.
We bought a hp laptop from Argos in October last year and in February it started turning off for no reason. until one day it never turned on. We contacted hp they collected computer and after 5 days returned computer. They left the laptop in test mode and despite long conversations on the phone they were unable to solve this so had to send another courier to collect the laptop again?. We have been promised a new laptop with a new warranty for 18 months. Waiting in for delivery!!!! Hp have a lot to answer for!!!!!!