Thanks for your reply Allan and helpful link. As you can see from the above post and my reply, the problem wasn't compatibility with BluRay but compatibility with the Intel HD 4600. Power DVD 8 was bundled with my BluRay burner which I purchased in 2011 and played BluRay discs perfectly for three years but that was on my old computer which had an ATI Radeon 4870 video card. The problem arose when I bought a new custom computer with i7 4770 processor and Intel HD 4600 graphocs. Thanks again.
Richard