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Jegajothy vythilingamFlag for United States of America

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Dell Optiplex 320

I was gifted this pc and I upgraded the OS to Windows 7 and also the RAM to 4 gigs and theHD to 250 gigs. One peculiar feature everytime I want to shut the pc down, I have to unplug the power cable, and then hold down the power button for 5 seconds, before I power up the next time.  Otherwise it hangs up after loading about 4/5th of the time.  I had posted the same question here, and experts suggested a few fixes, and I tried with the replacement of power supply since this seems the logical thing to do, because when I plug the cable, the pc boots up.  Another possible defect was the capacitors, but according to my pc tech neighbor, they look good, and the last recourse was the replacement of the motherboard.  Today I am having the same problem that it boots up up to 4/5th and then does nothing.  And then I have to go thru the same ritual again.
This time I noticed a a message, that said " previous attempts to boot this machine has caused a fault at checkpoint lthr, check with your pc tech specialist.  Hope someone can let me know what this error is and how to overcome this. thank you.
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broeckske

have you ran a memory diagnostic test ? you can do this via Dell diagnostic boot option or via de Windows 7 install DVD.

Is it still under Dell warranty ? if so you should open a ticket with dell support.
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It is out of warranty.  Dell support said that the memory may be at fault and to change it, thus I changed from the default memory to 4 gigs, using the same specs recommended by Dell.  
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schaps
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Is your BIOS up to date?
in answer to schaps, having 4 gigs of RAM would it hurt or cause to the smooth running of the PC?
In answer to snailcat, yes i have updated the bios to 1.1.1.12
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how much ram is showing ?
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Funny, by chance I decided to take a look at the BIOS setup before seeing this Post, and here is what I found on the Boot Sequence :
"This list specifies the order that the BIOS searches devices when tryint to find an operating system.  Only devices that are preceded by a number are bootable (the space key controlw whether a particular device is bootable)
No.    Listing
1      Onboard or USB CD Rom     (           )
2      Onboard or USB Floppy Drive    (not present)
3      Onboard SATA HD     (          )
4      Onboard PATA HD   ( not present )
5       Onboard Network Controller    (not present0
6       USB Devices        ( not present )

I changed the sequence to as follows :
Old seq     New seq
1                    4
2                   3
3                   1
4                   2
5                   6
6                   5

Did i do the right sequence.  I have not rebooted but will after I hear from u if I have done the right thing.  Also I have an external HD connected by USB (which on the original configuration) does not seem to show up.  
Your advice is very much appreciated.
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oops, PCIx should be PCIe
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In reply to all the responses, I do not have any cards on any of the PCI slots.  i only have 2 pieces of memory each is 2 gigs.  on a reboot, I cannot even get to the Boot Menu by pressing F12.  Will try some of the trouble shooting steps and will be back.
thanks.
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You'll need to enable the Boot menu from within CMOS setup.
To simplify the problem, I just dumped my present Dell 320 Optiplex for a new Dell Voesto 220. thank u everyone