Hi,
My RB450G works for 1 year, then the 2 center capacitors leaked and i’ve change them to 1000uF 16V HD(M) (You can find them at http://www.amazon.com/nichicon-Electrolytic-Capacitor-1000uF-10pc/dp/B004RHOZA8 )
RB450G works for 1.5 years until tonight, after power supply break and link again(Off/On) the “Blue LED” is completely ON and the Green One is faint .
I think there is short (short circuit) on the RouterBoard cause faint Green LED .
I’m trying to find this but i cannot find, But i’ve found that when i press my fingers on these 3 parts that can find on the attachment Green LED turned on, beep and RouterOS is loading and everything is okay, but the problem is the next Off/On .
Please tell me your suggestions 
I found instability in output voltage from power part of RouterBoard, i change 2 center capacitors and voltage stable again and RouterBoard doesn’t need any bypass with finger for Boot and start loading RouterOS .
[Solved]
For reaching a longer time of usage you could the next time trying out this once in combination with a RB450G.
Solid capacitor 1000UF 16V
I got 4 pieces for ~10 € and they are running until today without any problems.