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Invalid Operating System!


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I did try searching for a solution, but have not come across anything yet. I have a IBM T43, and I have windows xp and Mac OS X 10.4.8 (JaS version) installed.


With the Mac, I have everything working including ethernet and wifi. So my problem is, when I try to boot to the Mac OS, it won't boot. It just shows a black screen that says "invalid operating system!"


If I try to boot to the Mac OS with the 10.4.8 install dvd inside the drive, it boots fine everytime. First off, I have to say I initially installed Acronis OS Selector, but it kept saying "processing please wait", so I just removed it. I'm not using a boot loader yet, If I want to boot to windows xp or vice versa, I just mark the correct partition "active" using the Mac install DVD.


Anyways, has anyone come across this?? Why can I boot to the Mac OS with the dvd but can't without it?


Any help would be appreciated!



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