Windows XP SP3 is stuck in a 'Preparing to standby' loop

I have an Acer Veriton 6900Pro with Windows XP SP3 Pro installed. After replacing the
DVD/CD drive, which Windows recognized, it then went into standby mode. I hit the power button to bring it out of standby and then it started to loop 'Preparing to standby'. I unplugged the
computer, tried again,  and it still had the same problem. It works fine in safe mode - no looping  - I reset the power setting while in safe mode, but when I boot into regular mode the Preparing to standby loop returns. Any ideas how to fix this?

Thanks,
Ed
Ed_KayAsked:
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ggefterCommented:
while in safe mode, can you go into the power options and disble standby? what ahppens if you do that and then boot normally? Have you checked fro virus'/spyware? Did you install any updates lately. What happens if you just disconnect the new ROM device will it work?
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Ed_KayAuthor Commented:
In safe mode, I changed the power settings to never act - always on. I don't know how to specifically
turn off standby. And the loop is there is regular mode with the ROM device disconnected. Since it is not a problem in save mode, I am going to try using msconfig to load the modules one at a time to see if I can find the one causing the issue - wish I had thought of that sooner! Also the drive has been checked for malware.  Thanks...
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Kyle AbrahamsSenior .Net DeveloperCommented:
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Ed_KayAuthor Commented:
ged325,

Ok, that pointed me in the direction that I needed to go, but the system doesn't hang up on standby,
it loops. Acer has an intruder alert on this model, and when the case is opened, the BIOS needs a reset for intruder detection, see, http://support-web.acer-euro.com/app/csd/etkdb.nsf/4b7a708d8dbc41cdc1256bd6003c0165/ee22fe4bd6a9936cc1256e9e00279b28?opendocument. Now this is the first time in 20 years of IT that I have ever come across a problem
like this...Thanks for your input:)
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ggefterCommented:
good job, we all learn something new
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Kyle AbrahamsSenior .Net DeveloperCommented:
That's a really horrible design.  Should only hibernate on overheating not because I opened the case up.  That's gonna frustrate a LOT of people.  They really should document that more clearly (like put a countdown message and say check the bios.)  

Nice job finding the answer though!
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Ed_KayAuthor Commented:
For ged325: The link gave me some information that helped me to deduce the answer after visiting the Acer web site.
For ggefter: These are basic things that you would want to test, in order to rule them out.
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