Originally Posted by Whitebar
These "will not power on" problems sound like a problem with the power supply. This may be caused by using poor quality capacitors that do not work long with the modern switching power supplies.
This has been the cause of the Channel Master CM-7000 models failing to turn on that I have been repairing. Replacing a number of capacitors and the unit works again and will continue for much longer.
There may be hope - I looked at some pics of this model on eBay and it looks like it uses a wall-wart. So I would measure the voltage out of the wall-wart or try another wall-wart with the same output voltage listed (make sure AC or DC - probably DC, the output current rating should be the same or higher, and connector/polarity* the same).
*NOTE: Some connectors look the same but have different polarity.
If the Sansonic wall-wart is dead one can cut off the connector and connect it to another wall-wart if necessary.
If it's not the wall-wart there could be bad capacitors like Whitebar said inside the unit.