Computer geek needed

[rustic]

When you switch it on, do other lights flash, or can you hear the hard drive clicking?

If not, then it is more likely to be a hardware fault, most likely around the input voltage, power switch, charging circuit etc.

Do you know what happened to the original power supply?
If it went over voltage, then it may have blown a component in the power area of the PC.

You then have to consider is it worth getting it repaired or just removing the hard drive and get the data off it, as suggested earlier, or a PC shop could do this for you.

Compare this to buying a new one.

But checking out the old power supply would be a good plan.

Are you sure the replacement power supply is up to the job, both in voltage and current, otherwise you will get these symptoms.

Although, having fully charged the battery, ( or is it?) it should have started up on the battery alone.

Question:
Did the power supply blow the computer?
Or Did the computer blow the power supply?
My guess would be a failure of the power supply.