I was thinking that, or when your doing disk actions....
ok.... start with the simple crap...
Take it out of the rack, unplug it and take the cover off. Clean the dust and stuff inside and look for any obvious issues, like a leaky battery. Post a picture here.
If that's done then reseat all the memory cards, one at a time, and blow compressed air to make sure nothings in the slots.
The EOS samplers have multiple types of memory cards. Ram for samples, Flash ram/rom for the OS and the Flash/expansion slots. so don't swap them.
Reseat/check all cables, verify there in in all the way.
after the cleaning/reseating reboot the machine....
The next step is check the ram, rather by swapping it with other ram or removing it and using the stock onboard memory.
You may need to re-flash the OS... sometimes that can't be done if the machine is locked up.
Get to that point and then we can look it up. I think it needs a couple disks. But your machine may be to far out.