Optiplex 755 RIS Reboot Loop

I have spent the last ~2 days trying to get brand new out of the box Dell Optiplex 755s working with RIS. I don't understand how I'm having more problems with this one system than I have with all others Dells I've used with RIS combined.

The problem, as it stands, is this.

I have the Optiplex 755 SATA set to "ATA" or "AHCI", neither matters. I download the image (A fresh one or an existing one with the appropriate drivers in the TEXTMODE folder) by PXE booting to RIS (WDS Legacy mode, its a W2k3 SP2 server). The image downloads perfectly, and then when the system reboots, it goes to the Windows logo and reboots after a few seconds. This happens both with a preexisting image I've updated and with a brand new image I just built on one of these machines. It reboots over and over. If I attempt safemode on the new image, the lockup will reliably occur on either cdrom.sys. I tried disabling the cdrom and it did nothing, I imagine its not cdrom.sys causing this but I suppose it could be.

I'm losing my mind here, and I'm facing Monday with a lab that was supposed to be up this week still down.

Any help would be greatly and truely appreciated. If I get any suggestions I will go in Saturday afternoon and try them out.
GoatbertAsked:
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Chris BRetiredCommented:
If you tap <F8>, enter the menu and disable automatically restart, do you get a blue screen? It sounds like this machine has a different mobo/chipset which is not compatible with the others. Have you tried a standalone clean install, or load the image then repair install?

Chris B
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GoatbertAuthor Commented:
Fixed. So happy.

It looks like what happened was that because this was an image of a machine built on SP2 and then upgraded to SP3, RIS was pulling files from the SP2 flatfile and not the SP3 one. Uninstalled SP3, riprep'd and everything is fine now. I'll just built an SP3 image later, for now WSUS will have to handle it.

Thanks!
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