Cpu external frequency

[Guest]

Hello
my system keeps giving me this message,, During the last boot_up your system hung for improper freguency combination. the system is Working in safe mode. to optimize the system performance and reliability, make sure the freguency combination conforms to the specification of your CPU, DIMM and other connected devices. now every time i try to change it & save it. it will turn off & doesn't come back again.. i don't know what the problem & what is the Cpu External Freguency for it there is so many # plz help me fix it.
thank u

 

[r_manic]

Please list your specs. Your issue is probably caused by incompatible parts or something you set, but until you're more descriptive, we can't know for sure.