I found the problem with my printer, and I think that this may shed some light on some of other users problems with the current crop of power supplies.

After posting the first message, I decided to open up the power supply to see if there's anything I can do about it. And what I found may be the reason why we ar seeing so many defective power supplies with the current crop of Doodles.

As soon as I opened the brick, the AC connector fell off the PCB, and was hanging by the ground wire.  I simply resoldered the connector back to the board, and everything is working fie, but it was when I tried to put it back together that I noticed the real problem. 

It appears that the AC connector cutout in the bottom shell of of the power supply is not low enough.  When the connector bottoms out in the cutout, the pcb is still about 1/8" above the screw posts.  When you put the top cover on, the posts press down on the PCB corners, effectively bending the PCB.  So you have the pcb being pushed down in the corners, while the connector is trying to hold it high, so eventually the solder joints give up.

Take a look at the attached pictures and you'll see what I mean.

Hopefully the Solidoodle tech guys will see this post and check their existing power supplies, because this looks like it's going to be a real problem across the board.  The solution for those of us that got a defective PS is to cut down the opening for the AC connector to lower it and relive the stress (Image 5)

Good work. We came to the same conclusion and have spoken with our supplier.

After resoldering, I filed away the plastic to sit the connector lower.  Notice how high it was, I had to file away about 4mm.  On the picture it is not even sitting at the bottom, as the PCB is all bent, even though I made exactly the space it needed.

After posting the first message, I decided to open up the power supply to see if there's anything I can do about it. And what I found may be the reason why we ar seeing so many defective power supplies with the current crop of Doodles.

As soon as I opened the brick, the AC connector fell off the PCB, and was hanging by the ground wire.  I simply resoldered the connector back to the board, and everything is working fie, but it was when I tried to put it back together that I noticed the real problem. 

It appears that the AC connector cutout in the bottom shell of of the power supply is not low enough.  When the connector bottoms out in the cutout, the pcb is still about 1/8" above the screw posts.  When you put the top cover on, the posts press down on the PCB corners, effectively bending the PCB.  So you have the pcb being pushed down in the corners, while the connector is trying to hold it high, so eventually the solder joints give up.

Take a look at the attached pictures and you'll see what I mean.

Hopefully the Solidoodle tech guys will see this post and check their existing power supplies, because this looks like it's going to be a real problem across the board.  The solution for those of us that got a defective PS is to cut down the opening for the AC connector to lower it and relive the stress (Image 4)

Tonight, I plugged the power supply cable in, but the printer doesn't respond at all to any commands.  I tried unplugging the USB cable and I can hear the USB Plug N Play connection sound, I can also see the USB serial port device loading in the device manager, but the printer does absolutely nothing.

If I click any of the manual controls it appears to send the command, but nothing happens.

I looked at the back of the unit and there's red LED in the upper left corner next to a connector marked "E".  Something else I noticed, which I didn't pay attention the other day, is that the power brick LED iv very faint, and it's only lit if the USB cable is connected to the computer, otherwise it's off.

So what could be wrong with this thing?