I don't think the noise is due to you choose 24p mode. Please note that some Blu-Ray player (eg. 05FD, 51FD), their built-in noise reduction not effective in 108024p output. If you are using these Blu-Ray players and enable the noise reduction function. You will find that the picture qulity output at 1080-50/60i/p will be "cleaner" than 108024p. In the market, not many blu-Ray player can support noise reduction in 24p mode (as I know, only 91FD, 3800BD, Sony S350, S550). If your display has noise reduction function, you can try to enable it and see whether there is other side-effect.