Yes, because any upgrades can compromise the system (best to build your own) thus meaning your new more potentially expensive parts cannot be replaced and nor can any other due to the fact that your upgrades may have been the reason to damage your pc in the first place. Honestly if you have a degree you might as well build your pc as warranty is limited to the company who made your pc's engineers, it's cheaper and much more stable in my experiences similar to the comparison of a MAC and a standard pc parts and performance vs price, a standard pc for the same spec as a MAC is cheaper because it lacks the MAC os (worse in my experience, mind you windows ain't much better linux is better but alas there is not much support for gaming) you could build a standard worktop pc built for gaming to a very high spec for as little as £800, this is much cheaper than paying for a pre-made pc for which they charge almost £50 for connecting your cpu to your motherboard, basically putting a chip in to a socket, and you could easily do this, my brother who has little experience with pc's was able to build a high spec gaming pc with some internet guides and some elbow grease and unlike his pre-made old pc it does not crash regularly in fact its never crashed or frozen bar power cuts. But back to your question unless its say for example an Acer pc and your warranty is with them or a company which provides warranty for pc's bought from Comet and such, you must be a registered engineer with said company and bring it in for diagnostics to open it. In short your degree is not enough, upgraded pc never have full warranty your better buying parts with warranty, Btw if there is no warranty stickers open it put your upgrades in if something buggers up replace the stock parts and use the warranty. Sources: Experience.