What do I have to do if I sell personal computers after fitting an extra card to them?

When this is done, the person carrying out the act performs the final stage of manufacture of the product as supplied to the end user, and therefore takes responsibility for the EMC performance of the whole. The assembler should request details of the assessment carried out on the plug-in card from the manufacturer of that product. The directive does not require testing to be performed, and assuming the basic computer and the cards are CE Marked, the assembler may be satisfied with some simple derived tests to satisfy himself that the final product remains compliant. This may not be sufficient if the assembly consists of a larger number of modules fitted to a box containing only a power supply or power supply and mother board.