hello, my mac is in an environment without heating and recently the temperature dropped down to 19 degrees celcious. i have a g5 2ghz DC, and when i push the start button it does not make chime at all, starts up, then top and back fans speed up fast, very noisy and thats it. Some days ago, when i was working, the red light on pcb under memory (sits alone on the motherboard, but close to the DIM less, switched on Red, then mac stopped operating (no movement on screen) I removed, plugged ram in room temperature, restarted ok, then moved mac back to the colder environment and does not startup. Does this Ambient board has anything to do with the spinning fans and G5 not booting from HDD's ? Hdds are ok, ram is ok…. what is wrong ?