Hello there,
Pls contact our email:support-pc@bee-link.com,then please send us a picture of SN code at the bottom of machine and send us a picture about bios version on the bios main page. So that we could help you better.
This is the tutorial: https://mega.nz/#F!yuISGa4I!s1bQQajKwnsEdzjqq4nopQ
Please unplug the power supply and HDMI cable. Please press the pinhole of “CLR CMOS” (if no CMOS button, please put the pin in the CMOS pinhole and press it ) with a pin for about 10 seconds .Ten minutes later, plug the power supply and HDMI cable, turn on the PC again. Please wait about one or two minute, if you can go to the system, Please repeatedly press delete key as soon as your restart the PC, go to BIOS. Go to Boot option, enable fast boot, press F4 to save. Here is the tutorial https://mega.nz/file/2nIRGaYI#M2aIM2bkOJshrhE8sK8MNiKopfyHlqyjnn86TypZp2w
Hope it helps.Have a nice day!