Nothing at all works in iCal on MacPro

Question

I have finally got the new mobileme calendar to sync relatively normally with iCal on my MacBook Pro and iPhone. This was a trial in itself but I have managed to work out the quirky behaviour of the new calendar. When I tried to add my MacPro to the list of computers that sync to mm all worked except for iCal. iCal on the Mac Pro does not do anything: I can't add the mm account to the list of servers and I can't create a new event or calendar on my mac - options to do this are greyed out. There are no calendars in the side panel.
When I try to set up the mm server in preferences the password field will always revert to blank as soon as I hit return or close and open preferences. I also can't select 'push' (as I can on my MacBook Pro) in the refresh menu. I have deleted the plist files - com.apple.iCal.helper.plist and com.apple.iCal.plist and nothing changed. I've also tried resetting sync data for calendars in mm preference panel - it didn't work and I subsequently read that this has no effect with the new mobileme calendar.
I'm using iCal 4.0.4

Answer 1

The settings in System Preferences>MobileMe.Sync have no effect whatever on the new MobileMe calendars (and in a few days time will have no effect on any local calendars either): it should be turned off. The computers listed for syncing are irrelevant here.
The new calendar does not actually 'sync', though people tend to use the term as it looks as if they do. Like Apple IMAP mail or webmail, the calendars live on the server and are accessed by the various computers or devices you use directly. (By default a cached copy is kept on the computer so that you see it immediately and then updates come it as iCal reads the calendar, but for the purposes of setting things up you can ignore that.)
Under Snow Leopard, when you upgrade the calendar at http://me.com/calendar , all your existing calendars are moved to MobileMe. They appear in the sidebar under your MobileMe login name. You can still have local calendars on your Mac, under 'On My Mac', but these obviously will not be available to other computers: and the original calendars, having been moved to MobileMe, should have been deleted. The transfer can take some time if you have large calendars, during which some or all of your entries will not be visible.
If you go to iCal>Preferences>Accounts you should see your MobileMe account listed on the left. The username and password should have been filled in automatically, and 'Refresh calendars' should be set to 'Push'. (Leopard users have to set this up manually but as you are on 10.6.7 you shouldn't have to.)
From your posts you appear to have been trying to enter details for this in System Preferences>MobileMe - you need only have your usual details there and iCal will pick them up. Are you getting other MobileMe facilities - for example, can you mount your iDisk on the Desktop (command-shift-i, assuming you haven't turned iDisk syncing on).
Note that transfer of data beetwen MobileMe and iCal takes place only when iCal is running, unlike before, so you should not close iCal at any time that the rotating icon in the sidebar is present.
If you check through all the above but still can't get iCal to work do post back: however if it's that bad you may need the services of MobileMe Support. Go to https://expresslane.apple.com . Click on 'More Products & Services' in the left column, then when the centre column populates click on 'MobileMe'. Choose a category in the third column and click 'Continue'. In the page which opens select a category and add a description of your problem. Click 'Continue' to be led through support options.