Does not charge

If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.

The 2 flashing red lights indicate a low battery. Did you have the batteries replaced? and did you have the charger checked? The charger could not be giving you a full charge or you didn't charge the batteries correctly. It takes about 9-10 charges to bring the batteries to 100% operating capacity. Always charge the batteries before using after installing new ones and then charge nightly when you sleep. When you get up in the morning the batteries should be fully charged and last all day. Never charge more than 12 hours and always store or put up fully charged Hope this helps and sorry that no one can seem to help you except spend your money needlessly

The charging socket on you phone needs to be resoldered, OR the plug on the charging adapter is faulty and needs to be replaced.
To determine which is faulty, use a different charger and plug it into your phone and move the charging plug to see if the it quits charging. If it quits charging then the charging socket on the phone needs fixing (re-soldering).

Sounds like a bad charging board connection problem and needs to be replaced.The cost depends on the cost of the board and if the person repairing it is like most computer repair shops it won't be cheap by no means.That is if they are straight up and don't try to convince you to replace the whole motherboard.They love to charge for a motherboard replacement when its what connected to it causing problems.

the laptop battery is charged with an advance system to regulate the batterry life. To check your battery for optimum performance it is important to charge the battery at least once a week after the charge had gone down to less than 10 %. this will not allow the cells to develop reverse polarity making it drop in efficiency.
Now in the control panel you can open up the icon Power, you will find the status of the battery orr if charging the status of the charging. the icon can be alos found on the lower instant toolbar. the percentage of the charge on battery or charging percentage will be indicated when you place the cursor near to it. make sure that you fully charge the battery always and not to mid charge or run it too low all the time.the time you get for the battery to power your laptop will determine the efficiency of the battery.By these methods you will get good performance of your laptop battery. Helpful advice? good day

If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all.
OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time.
If the battery drops to an unacceptable charge level then the battery needs to be replaced.

If the battery will not charge or only has enough for a few minutes or less of power then it is (past) time to replace it with a new one. Depending on how you use and charge expect about 2 years of usable life out of a battery. They seem to make most of these just before quiting time on a Friday so they really don't last. I do have a couple of laptops I use both on and off the charger that are much older than that
One is from 95 and still gives 5 hours of charge.

First check if it might be replaced under warrenty. OEM or Store purchase warrenty's cover this.

If its coming out of your pocket it really pays to shop around. I was replaced one a week ago and was quoted $84 to $176 in town. The higher prices were from computer stores and were saying a week to get it in. The $84 was a battery store and was in the next day.

If you use an automotive charger you have to charge each battery individually as they should be 12vdc hooked in series.

Clean contacts and assure yourself that each lead is charging properly. Jazzy has many different models so it impossible to know which you have. But there should be some info on the charger to tell you if your output is 24v or 2-12volt DC leads.

Jazzy has a web site and there is a member section where you can ask questions.

I would try the following:
1. Remove the battery completely. If the computer boots properly several times in a row, then the battery may be causing the power supply to do strange things.
2. If you have experience removing laptop components, try removing the hard drive. Because you say the screen goes black (I assume the system powers off) sometimes after the HP logo, I doubt its Windows or a software issue.
3. If HP has a diagnostic CD you can boot to, try that.
4. It may be the power supply acting up. If it charges the battery, and if you can boot to Windows with the battery, try getting a new power supply.
5. Otherwise, it may be the motherboard of the laptop.

Ensure that the battery is in date and charging. Also it is the right battery amp hours and so forth. It could also be your adapter has weakened over time and can't handle the load of charging as well as powering up your PC at the same time. These are just possibilities. See if the Business where you bought your battery can test your adapter. It also takes a fair amount of time to charge a battery from initial use. If they can't maybe Radio Shack can test it for you.

Head the Warnings if you don't know your way around a Volt meter it can be Dangerous.