hi, this might be an odd question but when i turn off my comp it seems to reboot on its own and fires back into life. seems the only way of shutting it down is by holding down the power button a few seconds but have been informed thats not clever to keep doing so. ive recently had to change my graphics card but cant see that having anything to do with it. also tried shutting it down various other ways such as ctrl+alt del. any help?