Power connector My power cord connection is broken, 5 year old lost a part (spring) and it won't supply power when plugged in.

The Power Supplies for the MP600 burn out over time. They are easy to buy and replace:
My MP600 Power supply died as well. Web searches (including Canon) turned up nothing. Called Canon. To order power supply from Canon, call: 866-481-2569 (credit card over the phone, no on-line interface). $34.49 with tax and delivery.
Note: the power supply has black tabs the you push away from the grey power supply case. One tab in front and one in back. The grey power supply box pulls right out of the printer. The internal connector (six colored wires) pulls straight out (there is no release tab/catch). Use small screwdriver or needle nose plyers to carefully remove. Pull/pry the female white nylon connector. Do not pull on the wires.

Before calling it quits on the motherboard, try disconnecting ALL non-essential devices from the motherboard.

This includes drive cables, all slot mounted cards, etc.

Leave the processor and ram in place. Make sure ALL power cords from the power supply to the motherboard are properly plugged in. Some power supplies have 2 cords to the motherboard, a large plug and possibly a separate 4 pin that plugs in near the CPU. After checking your plugs, see if the board will power up. If so, you should get some beeps or status lights. If not, then it is likely the board has failed. Since you have replaced the original power supply, (assuming the replacement is compatible), it is not likely you have 2 bad power supplies.

If the board DOES power up, then plug in 1 internal device at a time to determine what might be "killing" the boot. A bad hard drive or DVD/CD drive can cause this as well as a shorted USB or firewire device.

> bad power supply

Try an ordinary lamp in the wall-socket -- to make sure that a circuit-breaker inside your home has not "tripped", i.e., no power to anything that plugs in.

If there is an on/off switch beside where the power-cord connects to the power-supply, switch it to the "off" ("zero") position.

Unplug the AC cord from the power-supply.

While watching the fan inside the power-supply, and/or watching the fan on top of the CPU, plug-in the AC cord. One of the fans may "twitch", if there is power.

Flip that rocker-switch to the "on" ("one") position, and see if one of the fans "twitches".
Also, look on the motherboard for a small lamp -- it may go on if the AC power-cord is connected,
or may go on when that "back" switch is set to "on".

Try a different power-supply. If still nothing, then it's your motherboard that got "fried".

Try something else (a lamp) in the extension cord. If ok, the case must be opened to expose the wiring. Check for 110-120 volts AC at the cord ends. If nothing, the plug end may have a broken wire. Cut back the end somewhat and install a new plug or just replace the power cord. If still nothing, remove the power connection and ohm-check the switch and motor. The switch should read zero ohms when on and the motor will usually read less than 20 ohms if good. If either reads infinity, replace the switch if so, and check the motor brushes for sticking or bad springs.Hope this makes sense and helps!

If you remove the battery, does the AC Adapter power the computer? Does the laptop have a barrel type power connector? I have replaced several power connectors for broken center pin. Does wiggling the power connector affect the charging light?

Is the cord broken in the computer, or the monitor or the pin broken and stuck in the machine? If it is in a desktop it goes into the power supply. Which you can change the whole power supply fairly cheap. that is if it in a desk top computer. 4 screws, 4 or 5 connectors and ta da new power supply, All you need is readings off power supply such as wattage. Good luck

A local PC store should be able to supply at least the power connector that is within the laptop. A lot of laptops only have solder points holding the power connector in place. Over time and putting pressure on the power cord will loosen those points. The power connector itself should cost about 50 bucks. Having it installed depends on labor charges.

G'luck

check the wall plug for power
I have had one where you had to wriggle power fitting in computer (bad plug)
Lap tops are getting cheaper so it could be a viable proposition to upgrade
Any competent local computer shop could transfer files from old computer to new
you could make it a condition of sale

You seem to have an oddball monitor if what you describe is correct. The power supply to a monitor[Display Screen is that what you mean?] is either direct to main power- in which case the power cord is either built in with a power plug for wall socket, or has a socket on the back for a separate main power cord. Or is powered from a low voltage converter that delivers low volts usually via a coaxial plug like this illustration PS2 connection does dot come into the equation as far as I know unless you have got hold of something unusual. Tell you what take a shot of the back of the monitor and lets have a look see mean while here's is a shot of a typical low voltage power supply available anywhere.