![]() ![]() To this day, if no hard drives are connected and nothing like a USB drive is connected, and there isn't a bootable CD in the CD drive, you'll see the typical manufacturer logo, and then a "Missing Operating System" or "No Bootable Device Found, Press to enter setup", etc. ![]() the Tandy 1000TL) if nothing else was bootable. When non-IBM companies cloned the PC (Compaq was the first to do that, I believe), rather than include a clone of BASIC ROM, their BIOS would merely display the message "Missing Operating System" - which is what you will see if you power on your system and no bootable device is found.Ī few computers had DOS in ROM and would start that (e.g. ![]() ![]() If you had a hard drive in your system, seeing this would scare you, as it could mean your hard drive failed. The very first IBM PCs would start a BASIC interpreter in ROM if no hard drives, floppies, or other boot media was present.
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