I'm glad I found this forum. In my case, the attached USB device was an IOGEAR USB KVM. I never thought this would cause issues, been using it for years on many HP systems, some older than the 8100, with no problems. Sometimes the usb driver was recognized and it would boot and other times it would freeze on POST at the HP screen. After unplugging the usb connection it boots every time with no problems. Thanks!
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