The HP DV6871 is one of the HP DV 6000 series notebooks, notorious for their power motherboard issues. Even laptops under warranty seem to have this problem and the only reliable solution HP has been able to give is to replace the laptop because motherboard replacement does not seem to solve the problem. However, just because the HP DV 6000 series is known to have power issues and bad motherboards, this does not necessarily mean your PC is suffering from the known motherboard issue. Troubleshoot the computer to find out if the problem is motherboard related, and if so, it is best to simply replace the laptop.
Computer Beeping
Some HP DV6871 power issues may cause a beeping noise, which indicates the issue. This does not necessarily mean that the motherboard is damaged, and the computer beeps can mean several things depending on the number of beeps you hear. For instance, one beep means the computer is starting normally, two short beeps mean there is an issue with the CMOS battery, while one short and one long beep can be motherboard issues, and three long beeps mean there is a keyboard issue. Continuous high-low beeps can indicate that the processor is overheating, and repeated long beeps can mean there's a problem with the memory. Check a computer beep list to see where the issue lies, if you hear continued beeping and get no video.
Video-Related Issues
Some cases of a computer power problem may be video-related and not a completely dead computer. Look for LED lights turning on as you press the power button. Lights may mean the computer is working, but there's a problem with the video or video cables. If you hear computer noises and see LED lights, plug in an external monitor to see if video appears on the external monitor. If this is the case, the problem is associated with the inverter card, the display, the backlight or the video card and not the motherboard. Look closely at the video monitor to see if there is a faint light, as this indicates an inverter problem, which can easily be replaced. All parts are replaceable except for the video card, which is integrated to the motherboard. A simple solution to a bad video card is the use of an external video card that plugs into the USB ports.
Memory Issues
Memory issues also will cause the computer to stop working even if the computer does not warn with a beep sequence. If the problem was previous to the computer total power loss and you noticed computer freezing, restarts or blue screens, the problem may be memory-related. Remove the memory module and replace it with another module, if possible, or clean the pins with isopropyl alcohol and place the module in another slot. Turn on the computer to see if you have the video.
Processor
An overheating processor may also cause computer power issues. To troubleshoot this issue, disassemble the computer, blow compressed air on the motherboard and remove the heat sink fan assembly. Place new thermal grease on the CPU and clean all the parts. Reassemble the machine and turn it on to see if you have restored power.
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