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I believe blinking lights on the Caps and NumLock means that there is a problem about the Hardware, I've been a Tech Support for HP and those blinking lights are problems for Video Card, CPU, Memory. It would be better if you call the manufacturer try if they can service your machine.
Some units will charge with the light on and when it reaches full capacity the light goes off preventing overcharging the battery. Now! you mentioned that the battery had charged, how long did the battery run? "should be around 2 hours" If you find the light comes back on to recharge the battery then this probably normal. But if the battery is ready to be charged and no light comes on, then it indicates the charging circuits in the motherboard is not working.
There are a few things left you can try. First take the battery out and make sure the unit is unplugged. Next push the power button a few times to discharge any power inside the unit. Now put the battery back in and while plugging in the unit see if the charge light comes on or flickers at all.
If it flickers and goes out, you have a bad power cord or worse a bad jack on the laptop's main board. If it never comes on, you have a bad power cord or mainboard. The battery is probably dead (doesen't have a charge left in it.)
You said this happens regardless of if the battery is inserted. Have you tried powering up the unit with no battery installed and just the power plug?
I'd see about gettting a replacement cord first. If that doesen't do it you probably have a bad board.
Most likely issue is that the cord has been damaged, or that the power jack has become loose.
First step is to remove the battery and try plugging in. If the light comes on, on the front of the laptop, your battery may be dirty or defective. If the unit will still not power, you will need to test your cord or look into a new cord. If the cord puts out the proper 19v (give or take .5v) then the issue lies with the laptop jack. Otherwise a new cord will most likely do the trick.
I had a Hp or compaq tablet *with swivel screen. I have a hard time myself trying to get it to beam up. what a pesky switch. But I do know what happened to it before it started acting bad.... the spot where I plug in the power cord got extremely loose.. and i had to hold it just so with one leg of mine in the air one under me.. :D joke but you get the point. Just to try to get it to charge up. I didnt know if it was just the plug... I found out later with the help of a charging dock. That it was in fact the chargeing hole... After about 5 hrs playing with the cord in the charge dock to get it just right. It charged up for a measly hr or so. But since then when I use the charge dock the laptop will boot up...
Have you tried attaching an external monitor when the LCD screen is disconnected from the motherboard? this connector is located under the keyboard strip – a piece of plastic just above the keyboard. If it works, this way, then the video cable isn’t seated properly in the connector on the back of the screen.Plugging the video cable back in should fix the problem. I don’t know how comfortable you are with taking apart laptops but I think that this information could be useful for you. Source: http://www.asklaptopfreak.com/laptop-notebook-help/2006/08/08/laptop-powers-on-and-shuts-off-immediately/
I had a similar issue with the Armada M700 from Compaq. Never did figure it out exactly. But I do know this. When you unplug the power chord and take out the battery and plug the power chord back in while the battery is out usually for some reason it turned on allowing me to replace the battery which would then begin charging. Your problem interests me because I can really relate!
This sounds like a battery problem. The best way to test this is to remove the battery and then power the laptop up with just the power cord plugged in but no battery. If the computer boots then the battery is bad you will need a replacement. Also try letting the battery charge for a day. Be sure that the charging light is coming on when you have it plugged in.