score:5
The whole idea behind making sure that electronic devices work is to make sure that the internal parts are not replaced with a bomb, if someone tries to smuggle a bomb inside an electronic device, it will not be possible to achieve that while keeping the original components intact, so the best is just to make sure the device is working and this will exclude any possibility of hiding bomb parts inside electronic devices (laptops, tablets, etc.). It is simple yet effective method.
Given that, computer parts are not the main concern here, the main concern is what underneath the holding case (laptop case, desktop case, etc.), so in theory parts will not be a problem as long as you EXPLAIN to the security personnel what are they. I am also positive there are not restriction of any kind to computer parts onboard.
Anyway, Here are few tips: