hi, my desktop computer system unit (emachines) cann't enter cmos setup. what is the problem.

You aren't providing enough information. Does the system boot up ok? If not, do you get some indication that the BIOS is starting the system? Is your system using an older BIOS or one of the newer UEFI chip sets? What happens if you hold down a key (such as ESC or one of the function keys) during boot?

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