Rigger is correct in suggesting that you bolt the board in. My 4000Tower had the very same problem , even after sending it back for repairs.. But my 3000Tower never had that problem... the 3000Tower was a Commodore and made in Germany .. the steel in the 3000Towers are probably the same they used in their tanks ... very tough .. just try to drill the box for an extra fan ...who knows where the 4000Towers and/or slots were made?? ...Ritty
