You recently tried Fixing your Hewlett Packard model DV6000 laptop computer by installing a new motherboard. Now you get a beep code which is three beeps, a pause then two more beeps. You will want to disconnect all peripheral devices and remove all universal serial bus devices and media cards.
You will want to test your computer and not any accessories. Also, you will need to disconnect an active current direct current power adapter, remove a battery, and then press and hold a power button for at least fifteen seconds. Then you can connect that active current direct current power adapter but do not install that battery, press a power button, look for glowing light emitting diodes near the caps lock and numbers lock keys, and Listen for sounds of a disk drive and fan turning. If it still will not boot properly or a computer basic input output system will not post then you can try seating your random access memory module(s) again.
You will want to install one memory module at a time if you have more then one. Also, you can try taking out your hard drive and booting your laptop computer. What you want to do is get your computer's basic input output system to post successfully, then connect or install any other devices and peripherals.
You may need to reset a computer complementary metal-oxide-semiconductor battery or real time clock battery. You might try this sequence in order to clear the complementary metal-oxide-semiconductor memory. You will want to hold a Function key while pressed, then switch on the power to that laptop computer.
You will want to continuously tap on an F11 function key. This will lead to some flashing light emitting diodes, cycling on and off. Then you can release that F11 function key, and your machine might boot again and show a basic input output system error message system options not set.
You will want to press an F1 function key in order to save those settings. You can double check all connections. Also, you can check random access memory, keyboard, liquid crystal display, modem, wireless, etcetera.
Potentially, only one loose cable, bad device, or not supported device can cause a basic input output system to not post. You can try booting your laptop computer with a bare minimum of devices. Also, you can remove your complementary metal-oxide-semiconductor battery and allow your laptop computer to sit for a few minutes with a battery pack and power adapter plugged in.
You may need to try a different memory module that is supported by your laptop computer motherboard. You can check to make sure the microprocessor fan is connected and spins when that laptop computer is powered on. Another thing you can try is make sure the power is off and make sure your laptop is not plugged in where by the charging adapter is not plugged in.
You can remove a battery pack from your laptop computer system. You will want to hold a power button for sixty seconds. Then you need to plug in a power cord, but do not install a battery pack. Finally, power on that laptop computer as usual.