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You're very welcome.

 

Something is wrong with the PC...messed up BIOS, bad motherboard...whatever controls the booting function is kaput.

 

It should just automatically boot from the USB flash drive just like it did on your W10 PC.

 

I have booted from plenty of DVD's and flash drives with no OS on the hard drive.

 

Never had a problem but once, and like you, try as I might, I could not get any device to boot.

 

I removed the hard drive, installed windows on it from a similar model PC that had no problem booting from a CD (Windows XP), put the hard drive back in the PC and it booted to the hard drive and ran windows just fine.

 

It just wouldn't boot from a CD/DVD or flash drive.

 

Sorry, but I don't think anyone will be able to help you with this one.

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