Dreambox reset problems - Displays nothing

Hi,

I'm new to the forum and having major problems trying to flash my Dreambox 500C. I somehow managed to reset my box and lost all my channels. I got the terrestrial ones back but everytime I did a scan it didn't pick up any other channels even with the correct keys installed. I assumed I needed to flash a different image but wasn't sure which one was best to use. Stupidly I thought I'd just keep trying ones till I got it right. I flashed the image 'EDG-Nemesis-3[1].3_DM500' and I've totally screwed up my box. When I power it on I get nothing just a blue screen. The remote does nothing and I can't connect to it from the PC (It's probably lost it's IP address)so I can't flash another image. Anyone any ideas? Is there a way to reset the box to the factory settings? There's no reset button on it. Any help appreciated.