There is some basic info here. Use the "Back to Contents" link at the
top, to see some of the other pictures.
http://support.dell.com/support/edocs/systems/ins600m/en/sm/sysboard.htm#1000473
The motherboard is pictured here. As near as I can tell, the power jack is
in
the upper left of the photo, to the right of the vent hole for cooling. It
is
a metal can, with the plastic jack component inside it.
http://www.parts-people.com/images/products/5u857.JPG
There is a company here, selling a replacement part for a ridiculous
price.
This is what you might look for in a replacement. The jack is made by
Foxconn.
http://www.notebooksolutions.ca/zc/bmz_cache/0/0cc0e2b24653ab64b06a0ccb80b7a03d.image.577x433.jpg
On Ebay, someone is selling 10 jacks for about $32 or so. I guess
selling them individually is too difficult.
http://images.marketworks.com/hi/72/72457/dellside2-10.jpg
To find them on Ebay, try
inspiron 600m power dc
You can see in that picture, the jack has four solder tabs
for the metal box. Those hold the metal box to the PCB.
The rest of the contacts may be electrical, and I can't tell
from the picture how they're connected.
When something is secured with so many solder points, if
the thing broke, chances are the PCB material underneath the
jack may be cracked. Normally, you'd just unsolder the jack
and replace it. But if there is damage underneath, that is
going to be harder to repair.
In terms of tools, you could use a roll or two of 0.050" solder
wick. And if you were feeling particularly extravagant, some
ChipQuik can be melted onto the contacts, to reduce the melting
point of the existing solder. That may help with the task of
removing the jack. If the unit was taken to a shop, they may have
a vacuum desoldering station, to aid in the cleanup. Solder
wick is what you use, when you cannot afford a proper set of
tools (which is why I have several rolls).
Paul