Try booting verbose. If it's complaining about OsxAptioDrvFix and relocation block, make sure you're booting from a drive with the latest version of Clover (3270+). This was a common problem with older versions of Clover.
If OsxAptioDrvFix doesn't work, try OsxAptioDrv2Fix (but not both at once).
For a 2500K, 2600K, or other Core i5 and Core i7 'K' Sandy Bridge CPUs you may need to boot with cpus=1 until you can either install the correct SSDT.aml or finish the install and put NullCPUPowerManagement.kext into /Library/Extensions/
If you get all garbled text and/or the message "Still waiting for root device" with the prohibited sign:
Try the install USB in every single USB port on your case, motherboard, add-on PCI card, USB hub, etc. and see if it gets farther on any of those
If you're using a USB3 stick, use a USB2 stick and try all USB ports again
The screen shot with the prohibited sign said "Still waiting for root device" at the bottom, which means El Capitan couldn't find your USB drive (pretty common). You can either use a USB2 drive and try all the USB ports on your system until it goes away, or else try a USB fix to just make your USB ports work properly.
The second screen shot showed graphics not starting. If you still are not using a discrete graphics card, as mentioned, it will help to review your config.plist to ensure the Intel graphics settings are correct.