I own my trusty old PlayStation 2 since 2001. I never ever opened it, installed modchips or did anything brutal to it. However, after five years of service, it started having problems with booting the games (only booting was the problem - once the game started, it worked OK).
The only solution was to open it and try to clean it. And... it worked! Now I can finally write that Katamari and Shadow of the Colossus reviews.
Here you can see the opened beast in my surgically clean work environment:
Also, we groomed Albert.