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Bilo koja kartica u računalu ima neke pinove za spajanje na matičnu ploču. Ti pinovi vrlo brzo postanu prljavi i često gube kontakt. Trebalo bi pri svakom vađenju određene komponente pinove dobro obrisati gumicom za olovku. Osobito to važi za memoriju. Prljavi pinovi su česti uzrok neispravnosti memorija. Prije svake prijave kvara bi to trebalo učiniti
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c/p iz Upgrading & Repairing PC's 15th Edition
One item to avoid is an eraser for cleaning contacts. Many people (including me) have recommended using a soft pencil type eraser for cleaning circuitboard contacts. Testing has proven this to be bad advice for several reasons. One reason is that any such abrasive wiping on electrical contacts generates friction and an ESD. This ESD can be damaging to boards and components, especially the newer low-voltage devices. These devices are especially static sensitive, and cleaning the contacts without a proper liquid solution is not recommended. Also, the eraser will wear off the gold coating on many contacts, exposing the tin contact underneath, which rapidly corrodes when exposed to air.