Mac CC makes long chime (Death chime?) and no screen display

[Macmccracken]

We got a CC that looked perfect. Super clean inside. No corrosion. No dust. We have not re caped it but plan to next. When we pull the logic board out and put it back it starts up and the green light comes on. No display on the screen. When we did this we got the death chime. Any ideas to try and get it on?

 

[ObeyDaleks]

A recap and a thorough clean would be my first step. Some of those caps and the surrounding areas look pretty bad. While recapping, I would look for any trace damage.