Non system disk or disk error
PC not starting always showing error message "non system disk or disk error"
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@gothkid1377 "Non-System disk or disk error" most likely a failed HDD. This error appears when your computer cannot find the OS. You could diagnose this by checking to see if the HDD still shows up in your BIOS and if your computer can load from another device into an OS. Use the HP ProDesk 400 G3 Maintenance And Service Guide to work on it. It will tell you how to get into the BIOS F10 on Startup and how to replace your HDD.
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