Here is one I found on Amazon.

www.amazon.com/.../B019WTRRT6

fireberd, I really appreciate your help but that board don't look like mine.  Mine doesn't have that Aluminum piece with the Fan in it.  Mine seems to have a Discrete Video Card also but to the Left and a Black Fan housing.  I just remembered I have a Speccy Chart so will look at that today, thanks very much as always!!!

Look on the board itself for a string beginning with DP/N -- that will contain the Dell part number.

It is almost always on the board near the memory slot(s).

Thanks guys, you are amazing how you find all these things.  I don't see any new ones though, I guess they don't exist, or would be way too much money?

That Code was really hard to see!  This is what it reads:

0XHYJF-74431-4B4-02G2-A00

I guess you have to know what numbers to look at, and I don't, but I do see which ones you are looking at. "XHYJF"

Now I see One new one 178.00!

I also entered this on the Dell Spare Parts site: XHYJF but nothing came up.

A few things I checked while working on this one:

1. BEEP CODE IS TWO BEEPS FOR: "No Memory Modules detected"

PULLED ONE RAM CHIP AT A TIME WITH NO SUCCESS, STILL TWO BEEP

CODE.

2. NO GREEN POWER LED ON BACK, INDICATING NO POWER.

3. INSTALLED NEW CMOS, NO HELP.

4. TRIED NEW POWER CORD, NO HELP.

5. NO FAN ACTIVITY: I DID HAVE SUCCESS WHEN I UNPLUGGED THE MOTHERBOARD, THEN THE FANS WOULD COME ON, AND OFF, AND ON, AND OFF CONTINUOUSLY.  AND USED THE POWER TEST LED ON BACK.   I HAD THE LIGHT COME ON WHEN MB WAS NOT PLUGGED IN.

6. THINGS I HAVE NOT TRIED THAT ARE LISTED AT DELL SITE? ALTHOUGH DID TRY THE MEMORY.  I DON'T THINK THERE ARE ANY EXPANSION CARDS.  THEREFORE I GUESS I SHOULD REMOVE THE "DATA CABLES" THOUGH I'M GUESSING THIS IS A MB PROBLEM?

"Remove memory, expansion cards and disk drive data cables to ensure they are not causing the failure. These components will need to be removed later to complete no POST troubleshooting anyway if the power supply is not at fault."

Thanks in advance for any advice!

There are no soft fixes for physical damage.   The ebay link for the board has exactly the same issue its dead Jim.  Power supply is another unknown factor. Not worth fixing IMHO.

So it's highly unlikely it's something like the Optical Drive?  I will test this just in case.  This is a really nice AIO, it's a shame it will need to go to the Recycle Bin.  

Won't Dell Warranty it for me LOL!

I had a neighbor with one of these and it died shortly after the warranty ran out.  They opted to dump it and now have an HP AIO.  I would have gone with another Dell but because the Dell they had died shortly after warranty they didn't want to buy another Dell (buying another PC was not an issue with them).

The irony is that just as with the Dell, the boards in most of the HP all in ones are made by Pegatron -- in other words, the HP is the Buick, while the Dell is a Chevrolet -- both really made by the same manufacturer, just as Buick and Chevrolet both come from GM.

I completely agree guys, and that is what we are doing, going with an HP this time, though I would not have myself.  I'm guessing this was some kind of Power Surge issue or something.  There are lot's of electrical storms around here, and folks don't always take the proper precautions.  They had a Surge Protector but who knows what else happened.  I will repair it if someone will send me a free System Board LOL...see ya, and thanks again to all of you guys.