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Why does this machine run extremely slow

I have a Dell Dimension 2400 that runs deathly slow.  I have reloaded the machine from scratch to make sure that I cleaned out everything.  From scratch in my book is start with a Low Level Format then load the OS.  This machine has a P4 2.0GHZ 512MB RAM 200GB HD.

First the install process takes about 5 hours.  Once XP is up and running it simply takes forever to do anything.  When you view task manager it constantly runs at 75 - 100% CPU Usage.  

I have tried replacing RAM, Optical Drives w/new cable and HD.  The only things I haven't done are replace the MOBO and CPU.  Wanted to you the experts opinions first.  I know from personal experience that this model is notorious for MOBO failure however I wasn't sure that this is a MOBO issue.  Thanks in advance.
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GTKINC
Asked:
GTKINC
2 Solutions
 
CallandorCommented:
Check to see if the BIOS settings got changed and if the cpu is running "underclocked" (the reverse of overclocked).  Everest will report the settings: http://www.majorgeeks.com/download4181.html

You should also check in the BIOS and in device manager for DMA access on the IDE controller, as opposed to PIO mode.
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GTKINCAuthor Commented:
As for the BIOS it is the Dell factory installed, meaning It won't allow for over or underlocking.  Never the less I did check it and it is set at compatible.  My other option is normal.  As for your second guess I don't have any idea of how to find that in device manager.  I can't find anything in the BIOS other than setting to DMA on or off.
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GTKINCAuthor Commented:
Since the processor is a somewhat easy thing to try, think that might fix it?
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CallandorCommented:
If you have a spare cpu to swap in, try it.

To check for DMA access in device manager, open the IDE ATA/ATAPI controllers and right-click properties on the Primary IDE Channel and the Secondary IDE Channel.  Under the Advanced Setting tab, the Current Transfer Mode should say Ultra DMA Mode.
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Craig_200XCommented:
sounds like a cpu issue to me too..
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GTKINCAuthor Commented:
I'll check DEV MGR the new CPU and repost.
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bhanukir7Commented:
hi there

has ur system been running that way from the start or had this been a recent development. the Dell machine u have is it a brand new or a refurbished one.  The possible issues might be with your hard disk if its a pretty old one. being magnetic media long usage makes write and reading data magnetically from the hard drive slowly.  
Second issue might be with overheating of the CPU which might be because of problem with the heat sink fan on the top of the CPU. So try to replce the hard disk with a new one or a spare one  and also CPU fan

this should help

bhanu
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GTKINCAuthor Commented:
Processor fixed it.  Sorry for not trying this first.
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