Hi
It seems that almost everyone has encountered the (now apparent to me) 7025's fatal flaw, the bootloader, its failure can be triggered by almost anything.
My machine had a similar episode to this and I am uncertain whether it was an image that caused the problem or just the fragility of the startup of the 7025.
If this has the same problem as my machine had, switch off, hold down the "down" button down and switch on.
Hold down this button until you get the ip address for the box, connect up your computer via a Lan cable (not crossed) to a hub or a broadband modem and type in via motzilla firefox browser this address after making sure your computer has its lan properties set to dhcp.
You should now see the bootloader screen on the computer, at which time you can install a new (NFI) image preferrably test with the original image from Dream as this fits on the internal flash rom - once you know it works then you can now do the hard wor and restoring the original image.
I will point out here, that you do not need to be connected to a TV or satellite cable to do this, these are only needed only later.
If you still have a problem then you most probably need a new power supply board.
Have fun