The whole environment is the same i had with 8.10, where the MD worked (core, md, switches, ip phones, ata, z-wave, etc... The only change is is the new 10.04.
Thats why i'm asking about template 28. Yes, i also did run the create TB?? (don't remember exactly the name) before trying to boot the md.
Okay, I understand what you are saying. Was this a DVD install or a net install? If dvd install, which snapshot did you use? If you used snapshot you should not run Diskless_CreateTBZ as it is already done for you. If you did a network install did Diskless_CreateTBZ.sh finish completey and tell you there were 'no detectable errors'?
Remove any manually created MDs on your core within webadmin.
Quick Reload dcerouter
Turn on the MD with PXE boot enabled
What happens on the MD's monitor? It should show you that it has 'Announced ourselves to the router' and that it is 'Running Diskless_Setup'. You should see these things on your MDs monitor when you PXE boot it the first time. Are you seeing this? If you are not seeing this, what exactly does the MD do when you turn it on?