I've been fighting a Dell at work with similar problems - it was either video or USB, hardware or software.
2 different USB drives from Dell didn't work, nor did a retail USB drive from Microsoft.
But today I made my own W10 install drive and it worked just fine!
Have you tried updating to W10? If you skip the product key prompt twice, it should automatically activate (if this hardware was activated w/W8 on it previously).
Beyond that, I'd have to guess hardware - but it's not real likely IMO.
Reverting back to W8 (or even W7) may give you different results.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
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