The laptop will no longer turn on, and I just get a black screen, but there is no problem with the power supply as the light comes on. Further information:
i tried removing the cmos battery and putting it back after 1 hour but nothing changed.
The last thing you can try is powering up on AC only - no battery. If that gets the system running, the battery is bad. If it doesn't, the mainboard is faulty.
It's time to replace the system board (or replace the system; this one may not be worth such a major repair, given its age and low-end nature.