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Treesa,
Sorry for the late reply on this, I've just now had the chance to get pictures taken and write out this little tutorial.
First things first: Open up the Left side panel (facing monitor, panel on left) by removing the air vent as seen in the picture.
Loosen the screw that is holding the side panel in place, but don't remove it - it just needs the washer part to go past the plastic, refer to picture.
Pull the side panel away from the system, it will swing out like a door, don't be afraid to pull on it fairly aggressively.
Set the side panel out of the way, then loosen all of the screws holding the metal panel on.
Remove the cable at the bottom using a small flat-tip screwdriver.
Once the cable is out, and the screws holding the panel are loose, grab the two handles on the panel and lift up until the circles on the panel line up with the screws then pull it away from the system. With the panel out of the way, you should see the Scanner card cage - these are the boards we want to work with to determine what is causing your issue.
In the first picture above there is a red arrow pointing to a large power connector. That can be removed to isolate the Scanner card cage from the system entirely. This will allow you to determine whether a board is causing the main problem or not. While the system is OFF, and unplugged from the wall, remove this power connector from the Scanner motherboard. Turn the system on again, and see if it stays on for more than a few seconds.
If it does, turn it OFF, unplug it from the wall, etc. Plug the main Scanner motherboard power connector back in, and unseat all of the RCV, XMT and SDL boards. Those will be found in the 2nd picture above. They are the Red, Black and Green tab boards. To unseat them, you will need to pull the tabs away from the board (one on each side of the board) until it is pulled loose from the motherboard (connected through large amounts of pins). You don't need to remove them fully from the system, just as long as they aren't in contact with the motherboard.
Once this is completed, turn the system ON and see how far it gets. If it stays on for a while and boots up to Imaging, turn it OFF and put all of the RCV boards back in. Repeat this process with the XMT and SDL boards until you see a failure. If you have a failure during one of these trials, take out half of the board types you put back in (if it was SDL's causing the failure, take out half of the SDL's, etc). Keep narrowing it down until you find the culprit.
Now.. if NONE of that works, it is more than likely the main power supply. You can find this on the Right side of the system while facing the monitor. The panel comes off just like on the left hand side. In the picture it is the large metal case with all of the wires going into it.
There isn't a whole lot you can do to fix it, unless you have someone who works on component level (ie, finding dead capacitors, burnt resistors). We offer hero kits, along with repaired (warrantied for a year) Aspen power supplies.
Let me know if any of this helps.