With the Hyper 212 EVO 4-pin PWM fan connected to the 4-pin CPU_FAN header (which is PWM) it should not beep and cough up the CPU Fan Error message prompting you to Press F1 to Run Setup at boot.
Even with a 3-pin fan connected to the 4-pin CPU_FAN header it should not beep and error because a fan is detected..But with a 3-pin fan on a 4-pin header, there will be no rpm control (unless there's a BIOS setting to change how the header functions, i.e PWM or Voltage Control as on some mobo's) and the fan would run at full speed..You can use a 3-pin fan connector on a 4-pin fan header, or a 4-pin fan connector on a 3-pin fan header..More on that
here and
here.
Your CPU Fan Speed should be shown in the BIOS -> Hardware Monitor and in software regardless of whether a 3-pin or 4-pin fan connector is on the 4-pin CPU_FAN header.
In the attached photo, I have a 3-pin case fan on my 4-pin CPU_Fan header..It does not cough up any errors on boot, it shows RPM in BIOS and Windows software (Fan Xpert 2 and others), but rpm control is not possible at all..The 3-wire fans for my Corsair H80 are connected to 3-wire Chassis Fan headers for control..I do not have any 4-pin fans.
I can use Q-Fan Control on my 3-pin chassis fan headers, but I use the Fan Xpert 2 software that's included in AI Suite instead because it offers more options and fan curves can be customized better/less noise.
If you are still having problems with it, you can Load Setup Defaults from the BIOS Exit menu and go from there..You could also totally clear CMOS by unplugging the PSU and removing the mobo battery for about 5 minutes..When you Load Setup Defaults or clear CMOS, everything (Q-Fan Control, First Boot Device, CPU/Memory frequency, etc.) will be put back to the original configuration and all custom BIOS settings you made, if any, will be lost and need to be reconfigured again.
And do not remove the CPU anymore just to clean the dust, canned air will do the trick.
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