I have had similar problems with a Fujitsu Laptop. Although maybe simple there are a lot of sensitive parts inside so did not attempt the repair myself. I was quoted £80 for a repair at my local computer shop.
In true fashion though I ended up buying a new laptop
TBH the laptop was about 6 years old and is now used in my office and has the power cable gaffa taped to the computer.
When I asked around, there was only the computer repair shops who would attempt this.
I first realised the fault when using the computer for DJ'ing and never realised the power was not connected and the computer was running off battery. Halfway through the Macarena with a bunch of 16 year olds the fault was noted (and computer kindly turned itself off)
Hence,even though a laptop is only used for backup, I am constantly checking the power light.
Sorry Darren - just re-read the post and it's probably of no help to you at all