My laptop has been working fine up to now, and its only like 2 months since I got it. The problem is that the charger has ot been working, it sometimes works and sometimes doesn't. This started yesterday, but it hadn't happened before.

I connect the charger to my computer, and to he power source, but neither of the lights that tell you that the computer is charging turn on.

My computer is a compaq presario CQ40

Its under warranty. Contact HP for a replacement power supply.