I currently have a System using a Lex BN790T Mobo and a 900MHz Duron Proscessor with a FSB of 100MHz. Upon installing a 1.6 GHz Duron (133MHz FSB) and setting the CPU FSB to 133MHz the system fails to start, with the optical drives lighting up briefly and the Harddisc light on constantly, with no Beeps or anything. It has a power supply of 230v and the RAM installed is 512Mb or PC133 SDRAM. Is there likely to be any problem with this or is my motherboard faulty? P.S other 133MHz proscessors have produced the same results.