datapoint 1800 (1980 )

First I am Maurice Hamm 30 years old and living in the Netherlands. I have a privite collection of old Radio's, Tv's and computers. The datapoint 1800, a dec pdp 11/23, a zx81, a commodore 64, a IBM 8086 etc. What has happend. I have reorgenized my collection room and got the craziesed idea to start up my DATAPOINT 1800 computer. (1980 ) This was my first computer and had for several years lot of fun with it. I am industrious seeking for somebody that knows something about this machine or has some information or docs I got the machine in 1988 and has worked for several years whith it. But now after several years I start up the machine and it did not start up, the screen keeps black !! There is power in the machine, the disks spins and the picture tube is glowing. There is also no response of the keyboard. I think the ROM is emty. There is no self test. I know for certain that it was in a working state the last time I had used the machine +/- 7 years ago. I opened the case to look for bad fuses or contacts but every thing looks ok. What has gone wrong? Question: I know its a long time and a very, very old machine But I just like to see this machine working again. The comp. works under DOS.G I have several programes and documentation and a wheel printer attached to this comp.. Please help me. Greatings, and a Happy new Year, Maurice Hamm