Inspiron 1545 power issue

Hi there

I have an Inspiron 1545 which had a fault where if the battery got low and powered down, the AC had to be plugged in to power back up but then the following appeared on boot:

RTC mode fixed - time and date may be wrong

I suspected the BIOS battery at fault so I followed the Dell support manual and stripped the laptop down. I found the BIOS battery laying in the internal casing!! I had bought a new battery so fitted this anyway. The laptop was put back together and booted up ok, however the touchpad wasnt working. I suspected that maybe one of the ribbons had become loose so I removed the keyboard and re-attached.

When I tried to boot it up the second time on the AC there was just a black screen. The light on the front was on to indicate that it had power but it just wouldnt turn on. I have removed battery and AC and held down power button for 30 seconds and tried again but now no power lights or anything!! I have tested the AC power on another working laptop and its fine, unfortunately I dont have another battery to test.

Looking at various forums this seems to be a common issue? Will this require a replacement board? If so whats the cost involved and where can I find the exact board to replace the faulty one?

Thanks everyone in advance.

Mark