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OpenSUSE 11.2 shows black screen while booting every 5th time

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http://forums.opensuse.org – Hi, I'm using OpenSUSE 11.2 64 bit. Sometimes boot fails and I get a black screen. It starts quite normal, but when it tries to start X and KDE, it fails and I only see a black screen. I can't switch to terminal and I can not reboot my computer by pressing "Ctrl + Alt + Del". It doesn't even shutdown by pressing the power-button. The only possibility is to switch off the computer. Then it normally starts. The problem also occures with a clean installation of OpenSuse. And it cannot be solved by updating kernel, X-Server and KDE. I would be glad if somebody could give me a hint (or even better: a solution) what to do. What files do you need? I'll post them. The same computer worked fine with OpenSUSE 11.1. I think, the new radeon driver could be the problem, I have to use it because I can not use fglrx anymore as with 11.1 I take a look into my log-files, but I cannot see any error. Sometimes it seems, that /var/log/messages is partly overwritten by restarting the machine. lspci: Code: 00:00.0 Host bridge: ATI Technologies Inc Device 5a31 (rev 01) 00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge 00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) 00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller (rev 80) 00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller (rev 80) 00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 83) 00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller (rev 80) 00:14.2 Audio device: ATI Technologies Inc IXP SB4x0 High Definition Audio Controller (rev 01) 00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80) 00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge (rev 80) 01:05.0 VGA compatible controller: ATI Technologies Inc RC410 [Radeon Xpress 200M] 02:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) 02:07.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC (rev 01) 02:09.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b4) 02:09.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 18) 02:09.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 09) 02:09.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 04) 02:09.4 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev ff) uname -a: Code: Linux notebook 2.6.33-24-desktop #1 SMP PREEMPT 2010-02-25 20:06:12 +0100 x86_64 x86_64 x86_64 GNU/Linux Stefan (Distributions)