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I will tell you the same thing I told ploppy this is extremely common on the 700's. I am almost sure this is your problem.

"Ok, first off I have an old compaq presario 700 and I have serviced multiple others. The power supply is integrated into the motherboard so buying a new one is out of the question. One of the most common problems with the 700 is the internal port into which the power cord connects often breaks. If you plug your cord into the back of your computer and can wiggle it around, the port is probably broken. The best way to check is to take out the keyboard and your cd drive and to look behind the cd drive at the port. The computer I am using the port completely broke off but I have been able to fix it up a little, just enough so it runs. Let me know if that is the problem and I will try to help you more."

I have more or less the same problem but i am not willing to have the Presario serviced from HP. I prefer trying it on my own as long as someone help me.
Could you please explain the procedure so that i can check if i can follow your guidance. After all I am going to need to purchase the appropriate screwdrivers e.t.c. if i understand what you will say....

thanks

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A short, practical addendum that builds on and without repeating the teardown instructions already posted.

Begin with low‑risk checks before any deep disassembly: confirm the AC adapter actually produces the expected DC voltage with a multimeter (check polarity markings), and try a known‑good, properly rated adapter if one is available. With the adapter plugged in (battery removed), observe LEDs and any flicker when the plug is gently wiggled — flicker with a steady adapter voltage points to a connector or board joint rather than the adapter itself.

If internal inspection is needed, power must be removed first (battery out, adapter unplugged). Use a magnifier and a continuity check to look for cracked solder joints or lifted traces around the barrel jack. When pads are intact a careful reflow of the soldered pins often fixes intermittent contact; when pads or traces are torn, a reliable repair is to solder thin, insulated wires from the jack pins to the nearest solid power test points on the board, then secure the wiring with hot glue or epoxy and provide good mechanical strain relief. Do not power the board while soldering, and double‑check polarity before reconnecting anything.

Tools and materials to have on hand: a small temperature‑controlled soldering iron (~25–40 W), rosin flux, thin gauge insulated wire, a multimeter, and a magnifier. If the jack is badly damaged or structural repair isn’t acceptable, sourcing a replacement jack or a donor board is the next step — weigh parts cost versus getting the machine serviced. These safer checks and targeted repair choices complement ’s access tips and match the common failure mode noted, while minimizing risk to the rest of the motherboard.

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Well first off to service any computer you need a few things, the correct tools, and an antistatic mat to place the parts on. Make sure when you buy an antistatic mat, that it comes with a grounding cable, and make sure you ground the cable properly according to the directions.
Presario 700's require a T9 torx driver to use, these can be picked up for a few bucks at any Autozone.
Once you have those two things you are ready to begin. First, remove the screws in the bottom of the computer, then pry up the panel that contains all the "smart button" (your power button, email, etc). Then lift out your keyboard and disengage the cable that runs to the motherboard. Then remove the screws on the heatsink in order from 1 to 4 and carefully pull up the heatsink and detach the fan cable. After you have accomplished this you should be able to slide out the CD drive.
Now, you should be able to see the back of the DC injack where the power cord attaches to the computer. If it is damaged, there is your problem, and I can further coach you on how to fix it. If you cannot tell for sure the only way to get a better view of it is to remove your LCD.

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