To my great surprise. my pc turns off due to over heat when nothing is in process i.e idle. it works fine and continuously without overheating and all but when i leave it untouched for 30-60 min. aftersome time computer display brightens up and fan start blowing temp rises too Tmax and it turns off. Task manager sometimes shows up high cpu usage but as soon as i touch the touchpad it goes away.and back to normal plz tell wht to do whts the diagnostics