Dell XPS m1530, power adapter not recognised.

Dear all.

I've got a Dell XPS m1530 and I've run into a problem that is widely known with this laptop. It refuses to charge my battery because it says that the power supply is not recognised. Well, I've tried the power supply in another Dell and it is fine. I tried out another Dell's power supplies from my friends and they won't work either.

Typically, second suspect is the power board in laptop. However, I've been always gentle with it and even if i wiggle/twist/press the plug it won't charge battery not even for a sec suggesting it's not a loose joint or anything like this.

Third option is that the decoder of power supply signature that is located somewhere in laptop has failed. Do you know where it is located? Is it on motherboard? Whereabouts on motherboard?

Now, a lot of folks downgrade BIOS from A12 to A09 and the laptop gets on with charging as it should. Alas, I've got 8GB of memory that is not supported by BIOS A09. Do you know if BIOS A11 sorts out the problem of charging battery? Dell took it off their site. Does anybody have an executable with BIOS A11 so I can try it out and see if it helps?

The bottom line is I do not want to spend $100 for a new motherboard because the laptop being 6 years old is still perfectly fine apart from this stupid signature receiver which I find a repulsive monopolistic practise. Anyhoo, never mind this, I'm running out of options. I got a temporary external battery charger which works fine, though, this is not the most convenient way of dealing with this problem.

BTW, is Dell prepared to help anybody with this problem? It is a well known issue that lots of folks rage about! I'd hope Dell has some friendly  procedure to deal with this issue and regain frustrated customers?

Thanks for any advices,

Peter