Intel D946 GZIS - Citrix - CDROM driver issue causes Win XP to hang

Hi. I have a client running win xp on several Intel D946 GZIS. The entire network is dependant on Citrix Presentation, with a client (version 10) on each PC. These (and only these) PCs hang before they reach GUI. Other MB no problem. Without CItrix - no problem. With CDROM disabled or disconnected - no problem. Safe mode is OK. After extensive experimentation we ruled out everything: it must be the MS cd driver (CD brand doesn't affect the issue, nor a SATA CDROM). Attempted to force update of cd driver to that of win server 2003 r2 (which is a bit newer). No luck.
The client is a big one, and we would really like to solve issue. Help, anyone?
madalabAsked:
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Michael PfisterCommented:
Maybe its a setting in the BIOS, like "Use DMA" or "Do not use DMA" for the ATAPI port the CDROM is connected.
I.e. try setting to PIO mode for the ATAPI port with CDROM may help.

Other things I'd try:

 - Check if there is a BIOS upgrade for your mainboard. Load factory defaults after flashing it.
 - install latest chipset drivers and network card drivers


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