New to the list

Howdy all, My name is Aaron Hayden and I have recently joined the list. Currently in my collection I have a C64, a PC Jr., a Hero robot and my trusty 486-66. I enjoy using the older systems and in some cases I think they're a bit more user friendly (at least for me). I was looking for some info on my PC Jr. and found the list. I'm sure I'll gain some knowledge and hopefully give some too. Which brings me to my first question... I was just recently given the PC Jr. however it seems it doesn't work. I have only plugged it in a couple times but haven't looked at it much more than that. I also do not have any documentation on it so I'm flying blind. When I turn it on the screen turns all grey. Anybody have this problem before? It has been sitting for a while but worked fine until it was boxed up. It came w/ two power supplies so maybe their both bad? Any ideas? thanks in advance. Aaron