Ultra 45 w/xvr-300 looses video signal when doing a init 6

Hello, I have some ultra-45's with the sun xvr-300 video adapter. Loads and boots fine, but after login doing a init 0, the systems looses it's video signal. If I do a boot without seeing the output the system reboots. Also at the login screen, if I try to do a console login, the screen goes away for a few seconds then comes back to the same login screen.
This all worked on solaris 10 11/06, but having problems with 10 08/07 release.
any help would be appreciated.
thx
G......

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To Set the Sun XVR-300 Graphics Accelerator as the Default Monitor Console Display
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procedure icon To Display Man Pages
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