11.3 on a Lenovo ThinkServer Problem

Hello. I hope this is the right place to post this. I loaded OpenSUSE/KDE 11.3 i586 on a Lenovo ThinkServer (MTM 6436-15U) with IBM BIOS 1.43 build M9EV43AUS. The install was normal. The start-up options menu with Desktop/Failsafe/Other options appears reliably. If I select Desktop I usually get a black screen and the monitor turns off. Sometimes KDE launches. Failsafe launches reliably.

Does anyone have an idea what could be wrong or how to troubleshoot this?

Thanks in advance.

Maybe a video card problem. But, 11.3 is no longer supported. 12.2 just became available.