I recently got my computer fixed up. It was upgraded partially for some time until I recently had it sorted. It's been working fine for the last few days. Now suddenly it won't come onto the monitor. It recognises that the cords are there, but there's no signal getting through. It was on Div. It also has Sub-D, doesn't help. Is there anything aside from getting inside it that might do something. Tried the obvious things like cables, etc (except a new one as I don't have another).