Hi Guys, Thank you for all your comments, things seem to of got off on the wrong foot, and I apologise for that.
To reiterate my fault this time without the panic factor.
Exact text on the Empeg screen which flickers on and of at random is no_memory error surrounded in a box
Software version 2 - beta 13
Hijack ver 426 (yes it was a typo)
synching via Ethernet and using Win XP Pro
I did take on board Marks comments and am currently re-synching my music database again from fresh. I don't know if this was the right thing to do as 21000 tracks are going to take some time, but hey it's under way as we speak.
Hopefully this will fix a bad playlist or corrupt mp3.
Once again thankyou for you help.