Switching accounts problems

I have four macs at home connected with airport extreme. On only the Intel 20" iMac I am unable to switch between users. In fact, if I ask for a login window I get a blank blue screen and power off is the only solution.
However, if before switching I turn airport off the problem goes away! In other words to switch between users I need to first turn off airport, then switch, and then turn airport back on again. On my Intel powerbook everything is just fine.
Any ideas? I am stumped!
iMac   Mac OS X (10.4.9)  

Nobody here would know why.  What happens when you try?  What messages do you get?

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    Original Message:
    Switch statement problem
    Xivilai Registered: Mar 3, 2007 9:52 AM      Mar 3, 2007 10:06 AM
    I am doing a question in which I have to make a simple ATM program that can withraw and deposit money as many times as the user wants. To exit the program the user has to hit "x". I have to use a switch statement. Im getting incompatible type errors after compiling it. Can anyone help me? Sorry if the formattings not too good.
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    break;
    case 'd':
    while(balance>0)
    System.out.print("How much do you wish to deposit?");
    deposit=UserInput.getChar();
    balance=balance+deposit;
    System.out.print("Your new balance is " + balance);
    break;
    case 'x':
    System.out.print("Goodbye and thank you for using this program");
    break;
    default:
    System.out.print("We were not able to process your request, please try again");
    break;
    }

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    Sep 7 01:55:09 imac-di-mariano kernel[0]: Kernel requests now disabled.
    Sep 7 01:55:12 imac-di-mariano kernel[0]: disk1s2: I/O error.
    The second disk is the one where I've Time Machine configured to start backups. It looks like Snow isn't able to correctly access the disk. I've never experienced something like that with Leopard. I will try to initialize the disk again with Snow and let you know soon.
    Anyway, I'll check inside my console again if there are more errors on third part software.
    Ciao
    Message was edited by: morianas

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