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Hello.The most common reasons for power issues are the battery, power jack and power adapter/cord.Power off and remove the battery. If the laptop powers on with just the adapter connected, your battery is faulty.If you move/wiggle the power adapter at the point where it connects to the laptop, and the power goes off and on, the power jack is the problem.The power jack is inside the laptop and either needs soldering or replacement. If a power jack problem, it should be addressed by someone knowledgeable.If no change, the power adapter is probably faulty and needs replacement.Hope this helps.
Why did you flash the bios? Did you flash it with an upgraded bios that you downloaded from the HP Compaq site for your model and your operating system? When you turn on the laptop immediately start hitting the F8 Key repeatedly to see if it shows you the SAFE Mode option. If so select Safe Mode and see if it boots.
Are there any blinking lights or beeps? This is very strange. Try removing the battery and the power cord, then press and hold the power button for 30 seconds. After 30 seconds plug the power cord back in (leave the battery out) and see if it boots. If it does you had a static buildup in the laptop and you released it by holding the power button for 30 seconds. If it boots, put the battery back in.
if all fails you can try to see if your system will go into System Recovery when you press the Power Button immediately hit the F10 or F11 keys repeatedly. If so you can set your system back to the way it was when your purchased it. That means you will lose all your data, documents, music, pictures and videos.
Check the power cord at the connector. Hp has a problem with the cords breaking internally. I had a problem with mine and found that if I played with the cord then it worked for a while. I ended up buying a new power supply.
Please check it another display i mean a monitor.When its come other monitor may be fault your laptop TFT.Or it not OK may be fault laptop motherboard.Repair it by a good technician,who live in your area.
The three flashing lights indicate the battery is dead. Since it still wont power up with the cable plugged in I'd say the port has gone. Try wiggling the adapter about in the port to see if it begins to charge. If not then you would need to take it to a laptop repair centre to get a new dc port soldered on or buy a docking station.