Okay guys I've finally come across this after exactly 1 year of having the PS3 (got it off ebay second hand) and there seems to be several ways of fixing this.
Extra coolant
Send it back to Sony
Take the PS3 apart
Buy a new one
Which is basically all the options I've been getting so far.
However these options sound risky (and Sony apparently charges $150 if it isn't in warranty (it isn't) and I've done everything the internet says to do to avoid the YLOD before I got this problem (clean the vents, etc) and the last time I cleaned it was less than 2 weeks ago, I do it approximately every month or so.
Buying a new one really isn't an option for me as I've only been playing it for a year and it cost nearly $650 AUD for everything (about 400 pounds) and just for one year? I'm better off not playing at all. (It's the rare 60gb version cos it plays my PS2 games too)
It just so happens that my dad has a friend that fixes these sorts of things (works on the PS3, that kinda thing) and wondered if that was my best port of call instead of trying to do it myself.
So has anyone encountered YLOD before and how did they fix it? Like sending it to Sony, doing it yourself, what kinda thing?