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You need to get the DC Power Jack Either Repaired or replaced...this is the "female" port where your AC Power cord plugs into.. To Repair the current DC Jack...First you'll need to look closely at the Positive posts to see that they are not broken.. If visibally ok.. then you can look at the Solder Connections.. they will need to first be Desoldered.. Cleaned, then Resoldered back in place.
You'll need to get another power cord that is identical in power and polarity and plug. One can buy a generic power supply from Walmart that will power most laptops or Radio Shack (Walmart is probably cheaper).
Once the new power supply is obtained, try it, and if the same thing happens, then the problem is in the female plug connection to the motherboard of the Compaq Presario C762NR Notebook.
The Notebook will have to be disassembled and the female plug connection to the motherboard will have to be replaced.
If the male plug end shows any fraying or excessive bending signs, then I would definitely replace the cord.
It is difficult to determine which is bad, the male or female part without changing the easiest part... the power supply.
Also, you could go to your local Compaq dealer and ask to plug in one of their power supplies to your computer and tell them the problem that you are having, determining which is bad, the male or female part of your power supply.
RJ -45 is a type of connector used on cat5, cat5e....etc cables to connect networked devices...the RJ stands for registered jack but there is really not much you really need to know about it....a RJ 45 JACK is a little bigger than a telephone jack, you'll notice the female type of input on your computer or laptop and the male end will be on the end of the cable that goes into this jack....hope this helps
When you plug the headphones in what happens is that inside of the jack the internal speakers are disconnected and the sound goes to the headphones. If both are playing either the jack is not inserted far enough or female plug is loose or defective. Replace or repair the female plug.
If you have forgotten your password and it is stored in the BIOS, then you can reset the BIOS to the factory default state by removing the BIOS battery, wait for over 1/2 hour for the BIOS to discharge and wipe its contents, then reconnect the battery. You will need to reconfigure the BIOS before Windows opens.
I do not know this model, but if the password is stored in an EEPROM chip then it is near impossble to reset it without knowing the actual password. It would be difficult to remove, if you know a friendly hacker with a piece of hardware that can read the contents of the EEPROM chip and then identify the password, so he can tell you what it is.
Best of luck.