My last few years at the airline that I worked at I did software analysis for them. This job required me to be in the air constantly working with vendors in other cities. I averaged something like 4 flight legs per week for the last couple of years. Most times I had two laptops with me and a camera with me quite often as well. Sometimes they were checked and other times they went on as carry on. This included airports in Canada, United States, Europe and Asia so my stuff saw a variety of xray units. Other departments worked with the various government agencies in all countries that we flew into to verify the safety of xray units on passengers. We had to do this so that we could put notice on our website on in ticket jackets if there were any dangers to any effects that passengers might carry. This was to satisfy liability concerns.
There is no evidence to indicate that airport xray levels, either those at the passenger screening points or in the baggage areas, affect laptops, digital cameras and their storage media. Motherboards fry and other electronic items quit working for a variety of reasons but to perhaps it is just a coincidence of timing that they saw an airport. I had a desktop computer that lost its motherboard, I certainly can't blame this for it.