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Have to try to update the BIOS on your machine? usually that's what HP support do, you can download the BIOS driver to HP website. If happens that you already updated the BIOS and still the fan is not working, it means that the Hardware is faulty.
Usually there are a few small screws holding the cover. The battery is located under the computer. Remove the screws and slide the cover off. You should be able to see the battery now. Just pop it out with a finger or two.
I'd try wiping and reinstalling the operating system or booting from a linux live-cd first to see if it's a windows issue or hardware issue. In the end though, yes I believe the motherboard is probably faulty.
Check and make sure the Voltage on the AC adapter is the exact same as your previous one. Just because the connector fits in the port, doesn't mean it's the right one. Look in your manual to figure out if your AC adapter voltage is correct. If it is, it's possible that you have a dead battery, it happens when surges happen during power outages. If it's so, look on the HP website for a new replacement battery. It should allow you to type in your pavillion model number.
Try using your laptop without the battery and just using your power supply (new universal or your old one).
If your laptop works on just mains power it means your battery is causing the problem, which is not unusual.