cgsecurity.org

I've been facing one weird issue since yesterday. I never encountered or came across such issue ever.

When I turn on my PC it shows the following message "Reboot and select proper boot device or insert boot media in selected boot device and press a key." What does it mean? I wanted to know what to do to solve this problem.

Any help would be appreciated.

You need to check if your disk(s) are properly detected by your computer BIOS. An extra disk/dvd/usb key may also be responsible for this message.
Boot from an USB key by example and check if the partition table lists all your partitions/drives.
Check if you can browse correctly the files from each partition...