Update No. 5 for Yosemite on HP Microserver:
As I have been cloning the Yosemite install with SuperDuper to keep a working copy on a separate drive, I managed to delete the HD Recovery partition on both drives. Due to cloning the second drive once I had a working version of 10.10.4 on the first. Fortunately I found a site with an AppleScript written by Chris Silvertooth (Recovery Partition Creator 3.8), which works with Yosemite and I have successfully replaced the deleted recovery partitions on both HD's. This has resulted in the Favourite icons in Safari (on any new tab) being their normal colours not Red as previously was the case. I may need to add some Bootflags to get the Recovery partition to boot.
I also believe that Bronya's new kernel for 10.10.4 contains the routine to deal with the white icons on launchpad as I have not had to run this again since the 10.10.4 update.
Clover on the Microserver seems to be more trouble than it is worth, bit of a steep learning curve to get it working without any glitches on the AMD system. So I will be sticking with Chameleon for the time being.