Koh Young 3030 SPI machine. Has been running for the last 1-2 years. Now, it boots up as expected, up until the point where it should Home, but it does not Home. Any ideas what could cause it not to home. I know the older KY's are sensitive about the boot up process, and I've used the exact same boot up process as the last 1-2 years and it simply doesn't home.