I am using an iMac G5 from the last 18 months and that too the 20-inch flat monitor. Till now it has served me the best but the only problem that I have started facing recently is that the computer suddenly goes in sleep mode and that too without any warning. I mean to say that when I am using any application or busy in work then at that instance also it will go in the sleep mode. I don’t know what is wrong with the system and also unable to find out any solution for it. Actually the system should go in sleep mode when it is in the idle state but here it is totally opposite that I am getting a sleep mode even when the system is fluently working.