Acer 3100 5100 Motherboard HCW51 LA-3121P MBABK02001 TESTED This Board has been tested and is 100% Functional   We sell this Board with 14 days money back guarantte.   Bottom case is include for the sole purpose of providing protection to the Board during shipping. It may be missing some holes for the screws. It has Windows media COA  We do our best to describe items as accurately as possible, but mistakes happen. If you receive this item and feel it's not as described, please contact use first to resolve. We are customer friendly and your satisfaction is our priority.  EXACT ITEM PICTURED