after two years of great reliability. in anticipation of mass effect 2, i decided to go ahead and beat the first mass effect. now my 360 has the 2 red overheating rings. damn thing won't stay on more than 2 seconds before the red lights flash. the disk tray was only half way open for me to remove the game. I bought a 2 year full replacement warranty from best buy. lucky for me i still have two months left on it can i just take in the 360 without the hdd, power supply, or av cables ? will they let me switch out the HDD if the original hdd is needed?