I have a dell inspiron 6400. Switched off last night & it was installing the updates for XP & then shutting down.
Have switched on today and nothing. Won't boot at all just a black screen & a flicker of the power light on & off . Am using mains as battery is not very good. Power source is ok . Probably a lost cause but thought I'd ask .
Tried that , I don't think that's the problem.
Battery has not been good for a while so have used mains power for a long time.
The power light is blinking with & without mains power. Mains power charger has a green light on so is working ok
Left till this morning. Then plugged into mains & it booted up . It loaded on to desktop , but just switched itself off. It is now randomly booting & switching off . At one point I came into room and it had a blue screen and it was running CHKDSK.
It said volume was dirty and was performing several steps . It then switched off before completing.
I have since tried to boot in safe mode & do system restore but it always switches off before it completes the process . This has all happened since the XP Update that was installed when I was shutting down on Wednesday night.
If it boots and then switches off I think Fruit Bat /\0/\ 's suggestion of a faulty psu is right. If so don't play with the laptop until you can verify the power unit is faulty. Doing so might damage the motherboard. Do you know someone that can check the output of the psu?