Hello @ ALL! Note: I've open this thread, because I need support for my problem! Did a post like this - but I earned no answers, so I'm sorry for this "Double Entry". As the Titelbar show you, do I've got a very uncomfortable Startup-Problem, wich I indicate as a driver - load up fail - (I think - that could be the problem). Okay, at first I've to say, that I'm german and I can't english the best, but I'll try to explain my problem as best as I can. The Systemsettings and Hardwaresetting are as following: Windows XP SP3 Asus P5B Deluxe 3072 Mb of RAM @ 666Mhz IntelCore 2 Duo Quad Q6600 with G0 Stepping @ 3,0Ghz SAPPHIRE HD4980 2D- standards = 250Mhz Coreclock and 400Mhz RAM-Clock 3D- standards = 885Mhz CoreClock and 1015Mhz RAM-Clock DX diag: http://rapidshare.com/files/300482873/DxDiag.txt Same Problem is by the way with Vista Ultimate 32 bit too. Okay so I'll explain, what my Problem is. - At first I had a nVidia 7950 GX2 in my system installed and deinstalled the drivers with "DriverCleaner". Then I shut down my system and installed my new HD4980, made a restart and installed the latest drivers from the manufecturer page - of cause the Catalyst too. Then I installed the ATi Tray Tool and seted at first the 2D-Settings, then the Fansettings to: -35°C = 35% -45°C = 40% -50°C = 50% -60°C = 60% -65°C = 70% -70°C = 80% -80°C = 90% -85°C = 100% After this I seted the 3D- Settings overclocked to the values I told (885+1015) and tested them - all works fine. The automatically overclocking too. Switching between this 2D settings and 3D settings by Hardwareacceleration works fine. Then I restarted my system and started Vista. Okay - same there - deinstalling drivers and install the new ATi drivers at least ATi-Tray tool. Next day... started my System-> XP... at the Starting Screen System hangs up!... Restart by the Resetbutton of my Towercase... Starting Windows normally = YES! ... system started without hangup?! Okay... System was working good - wanted to see some tests under DX10 and shuted my system down - restarted Vista = same problem - Startup hangup... resetbutton => Starting Windows Normally?= YES! ... started without problems?! I thought it could be a virus or something like that, because, if my system was without energy, and I started it next day I had startup problems, but after the entry "Start Normally" all works fine under XP and Vista too?! After "Newstarts/Restarts" by the option under Windows XP and Vista, was this Startup Problem not reported?! Okay, I thought that could be a virus or something like that - so I reinstalled the OS's and after all doings, I got this problem again - but only AFTER the setup of the ATi-Tray Tool... -> So it have to depend on the ATi-Tray-Tool - but how?? Do I have to set some settings different? Please I need help or I have to do this! pc1::biggun:!) - LOL! I'm a little bit experienced in PC-Hardware and Software, but this problem I've never seen before! Someday there're new problems, wich I've never reported before - but this problem is making me angry... of cause! Oh.. short sidenote: Mainboard drivers are the newest Beta drivers. For Drivers at all I keep my eyes open and hold them to the newest ones - if there're no problems with them. Greetz @ All... Cyber!