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The computer above did not seem very dirty from the outside, but after opening the case we found out one of the dirtiest PCs ever. We cleaned it for our customer, so that he can continue using the PC without the many risks that dirt creates.
When dust piles up it can create shorts which will break your PC, it may also get into the connectors and make your PC fail randomly. Dust also tends to cover the fans and heat sinks, which increases your system temperature (higher temperature means slower or unresponsive PC) and eventually your fan or processor will break.
Please contact LoreaTec if you need to clean a PC.