MacBook Air A1304 and MB Pro A1286 wont boot with the same issue.

I have two A1304 Airs and a MacBook Apro A1286 Mid 2009 with the same problem:
Battery is o.K. and fully loaded.
When I try to start, the fan spins up, screen stays black, no sound, no beep. Sleep LED is lit normally. After a few seconds, Fan stops spinning, LED goes of. After one more second, fans spins up again, LED is lit again but no chime, no picture, no startup.
When I disconnect serveral parts as HDD, output bracket, battery or magsafe, it still does the same.
Any suggestions (besides "new mainboard") . Is this a knwon problem that can be repaired by reparing components on the board?
All three machines seem to be produced in 2009 - may there be any similarity in components that fail now?

I like it very much. I use it on my iPad (and occasionally my iPhone). I'm kind of a keyboard snob actually. I tried the Apple wireless keyboard first. Apple keyboards have a short throw that hurts the tips of my fingers. They're very pretty but the on button turns on when I don't want it to and my iPad wakes up in my bag. Strike 1.
I went to a little keyboard called the Joy and it had a positive switch so I didn't have the wakeup problem. It worked well though after several months I wore it out and had to replace it with another one. I also didn't like how flat it sat and used rubber bumpers on the back. It too had a short throw that hurt my finger tips after a while but it was better than the Apple.
Then I discovered the Logitech bluetooth keyboard, the K811. This is a great keyboard. It switches between multiple targets with one press, it has a positive on/off switch, the keys light up, it's rechargeable and lasts a long time, and the slight cushioning on the keys keeps my fingers from hurting. I put the rubber bumpers on it though like the Joy because I like the keyboard to sit up a little. It's a tiny bit bigger than the other keyboards but I like it a lot, better than my MBA keyboard and better than my iMac wired keyboard. I'm trying out an after market keyboard on the iMac now but I'm thinking about switching to one of these for the iMac.

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