там . USB Problems
Can't boot from install USB, or
Mouse and Keyboard don't work in installer
Check BIOS settings (these names from a Gigabyte board): XHCI Mode=Smart Auto, EHCI Handoff=enabled, XHCI Handoff=enabled
Try installing the El Capitan USB Fix on your install drive. That should make any USB port work for the install.
On a 5-series board set FixUSB_1000 in config.plist (or Clover Configurator / ACPI / DSDT / Fix USB)
Try plugging into different USB ports. USB2 ports might be the best bet. El Capitan is known to have issues with certain USB ports being disabled on certain motherboards (see next).
On P55/H55 boards, many things to try, no single solution for everyone:
Disabling USB3 in BIOS might help
Try these config.plist settings
Try in Clover Configurator / ACPI / DSDT check the box for Fix USB
Try using a completely different procedure.
A compatible add-in USB2 PCI card is reported to work.
Using an external USB2 hub is reported to work.
There's this procedure to install with USB working