Hello,
When I turn on my PC and then press F8 then appears the "safe mode" page I can't move down or up.Any solution to fix it ,tip I can't boot in normal mode.

Sounds like you have a virus that has disabled safe mode to prevent you from fixing the PC. You might look in the bios though to see if a keyboard setting is messed up.

Basics, try another keyboard firstly, preferably not a usb on. Make sure the keyboard is securely attached to your PC. Also unplug the keyboard and check if the pins on that keyboard cable are not damaged or bent.

Can you access the BIOS? Switch on the PC and press DEL and F2 a few times. If you can access the BIOS and use the arrow keys there then your keyboard is fine. Reset you BIOS to default settings just in case.
Most probably your PC is actually freezing on that F8 screen. The problem then is then your hardware (Hard Drive, Ram or power supply)

Yeah try what GrantHillsSA said also
If you have a ps2 port and keyboard try that but if only usb and are able to get in bios if there is a option for USB legacy support make sure function is enabled.