Emu XL-7 & MP-7 User's Group

I was adding a new sound rom this morning and after installing the 
SIMM my MP7 wont boot.  When I turn the power on all lights are 
illuminated and the OS never loads.  Nothing is displayed on the 
LED.  I removed the SIMM and tryed it again and the same thing is 
happening.  I have had this problem once before after installing a 
SIMM, but it was caused by a cable that came disconnected.  I have 
verified all cables and am still having this problem. Please Help!!!