Also check that you are using the right adaptor. From the picture, it looks like a bit like one of the adaptors will fit into the power socket on the Chumby, but will actually be too small to make a proper connection.

No, it's definitely the power supply.

As they die, they will still show the correct voltage on a voltmeter, however, they will not hold the voltage when under load.

Don't worry about matching the plug, which is apparently very hard to do, just cut the plug off your old PSU and use it to replace the plug on the new one.  Make sure you leave lots of cable on the plug so you can re-do the connection if necessary, get the polarity right, and insulate the wires properly afterwards.  If you don't have the skill or tools necessary you could ask an electronics repair shop to do it for you.

HEY You Guys,

Got a new power supply (Duane) from the place u suggested & guess what,
the 1st 1 they sent WAS Defective, MY Chumby works fine now!!!! U cannot a=imagine my delgiht.

Thank you, many many THANKS from little ol' me here in the worn out City <3

A great way to splice wire is the lineman's splice, or "NASA" splice.  It's sort of like the "new" method suggested via Bolo's link, but the wraps are a bit tighter, and a bit more insulation is stripped to allow for a certain number of wraps.

http://blog.makezine.com/2012/02/28/how … standards/

The NASA standard of course involves soldering, but your Chumby probably isn't going into space any time soon (probably, anyways!) so it's probably not necessary.

An important thing to mention when splicing wire is that, in multi-conductor wire (like the two wires of a power supply cord), you should always stagger the splices.  Always.  What this means is that the splice for the (+) wire should be done about 2 inches apart from the splice for the (-) wire.  Even though you should be individually wrapping these splices anyways, staggering will prevent them from ever touching one another (thus shorting out the power supply, possibly causing a fire) even if the insulation on the splice falls off/wears off/cracks/gets chewed by your pet iguana.

It's worth repeating, stagger your splices!  In case I forgot to mention it, always stagger the splices.

Oh, by the way, stagger your splices.

Guess what?  Yup, you guessed it.  Stagger your splices.

Huh? What should I do with the splices?

For those wondering what I mean by staggering splices, a picture is indeed worth a thousand words.  Okay, so maybe cheesy paint pics are only worth about 500... still, this will save myself a lot of typing and help out you visual learners

Of course you should still individually cover each splice (ideally with heatshrink, but electrical tape will work too), as well as put something over the entire spliced section for additional strength.