Apple Studio Display 21inch - calibration fails

G'day all, I've reviewed the topics on this display and none seem to fit my problem. Further, I'm convinced that it's not a display problem but an OS Tiger 10.4.11 problem but I reckon that this is the forum that will be best suited to answer.
In essence, the problem is that a get an overly white screen with very bold colours - as if the contrast and brightness is on steroids and I cannot get past the first page of the ColorSync Assistant. This condition occurred as a result of allowing a service technician to use my Mac to set up a satellite modem - you'd hope that technicians would be more responsible . . . . .
Anyhow, as I said, I'm convinced that the problem has more to do with OS 10.4.11 than the display as this works perfectly with another user. Specifically, the technician was logged in as PowerMacUser (isn't that original?) and that is the user which gets a problem display. If I log in as another user (i.e. PowerCenterUser - yes! there's one of these on the network) then the screen is normal and I can calibrate the display. So ColorSynch and the Studio Display are working.
But when I log in again as PowerMacUser nothing has changed. I did make sure that the color profiles in the Computer/Library/ColorSync/Profiles/Display were the same as those used for PowerCenterUser even though they are global, but that didn't make any difference. And I have tried to find out where user-specific data is used to modify display profiles but without success.
I have a suspicion that it may have something to do with a file named <boot> but I won't pursue this unless I have a prod to so do.

This is an update. I'm a bit impatient so I got up at 02:30 and did some more research.
I found that the file boot.efi was still in my trash (OldUsers . .System>Library>CoreServicesboot.efi) and followed BDAqua's excellent advice in regard to this (see http://discussions.apple.com/thread.jspa?messageID=11661635&#11661635).
Thus I verified both discs in the PowerMac,did a Safe boot - which failed to correct the colour problem. I then reinstalled Mac OS 10.4 - which failed to correct the colour problem and I'm now in the process of bringing this up to OS 10.4.11.
The only approach that I can think of now is to create a new user since users other than PowerMacUser (see previous post) do not experience the colour problem.
Any, more creative, ideas would be welcome.

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