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Have you attempted taking the battery out and while the battery is out holding down the power button for a few seconds? If this doesn't work, First test your charger to ensure proper charging. Clean charging ports. Remove battery and clean brass contacts with alcohol and q-tip
Start with pulling the battery and power, then hold the power button in for about 30-40 seconds. Then plug the power back in (still no battery). Try to power up the computer. If it boots, shut it down and put the battery in and try again. If it boots the issue was cleared. If it boots with the power cord but not with the battery added, you have a battery issue.
had a similar problem,and I resoleved it via a bios flash..this allowed the hardware to be fully recognized and to perform the specified role.For some reason,the bios software for this version seems to corrupt after several years. I have had my machine for the last four years..until it recently started giving the issues,it had no problems.
Alright, not sure if this will help, by my understanding is that you are saying that when you power the computer using the power supply adapter, nothing comes on? Then when you have your battery installed on, then there are lights blinking from your battery charger LED amount of times. In this case there are no promblem with your laptop and it is your power supply adapter that is damaged and will need to be replaced. It is not charging the battery. The battery is still good, but does not have enought charge to power up your system. You can find a charger on ebay for a good reasonable price compare to getting it from Hp. I hope this can help you.
please check first that does the notebook work fine on the battery mode. if system does not work on battery mode also it is a fault of the board that would have to be replaced
if it works fine on battery, then the problem could be with the adapter to check the same, please try using another adapter or the same adapter on another hp notebook. if the adapter does not work on another notebook, please get the adapter replaced.
Try purchasing an original adapter. I've had several machine of different make through my shop that the Targus adapter just simply won't run. For example, a Dell Inspiron 1100 and HP dv4000 won't run at all, and a Dell Latitude 1501 and Gateway crv503 will run but won't charge the battery. Targus adapters are junk, if you can, get your money back.