Hiya, I take it this is a desktop pc,if yes unplug the power cable,take off the side panel and make sure all cables are secure especially to the hard drive,if all are secure replace panel plug in the power cable and turn on while pressing the key to enter BIOS(usually F1) in bios check the boot order settings making sure HDD or DVD/CD ROM is the 1st one.select save and exit.
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