hello, im a newbie here and i don't play my ps3 too often, however today i tried to play but it just wouldn't turn on. the green light will come on for a bit then make a sound turn yellow then red. i read the trobleshooting section on my book but all it said was that it may be overheated but i have the cooling system hooked up to it sinc the day i got it. i don't know much about the system so please any info will be appreciated. thanks.