Check the capacitors on the motherboard, Dell had a BIG problem with faulty capacitors on the GX270, GX520, GX620, GX745 and GX755 units. The parts would cause the unit to either not boot at all or lockup booting or running programs. I would bet you have some that are just beginning to fail and the motherboard power is not stable which would mean the chips are not getting enough power. Here is a link to an article about the issue and what to look for on your board.
http://www.ccl-la.com/blog/index.php/dell-optiplex-gx620-motherboard-repair/
I hope this helps you out, if so please rate my solution.
BuddyMc
SOURCE: Adding network drivers to dell optiplex gx620
Just download the drivers here the link http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=WW1&osl=en&catid=&impid&SystemID=PLX_PNT_P4_GX260
SOURCE: Dell OptiPlex GX620 starts up then shuts down repeatedly
There are 2 probable causes for this. What is the power rating on your power supply? Less than 400W is going to have a hard time running newer boards and a SATA drive.
Also, how many cooling fans do you have? hopefully you have at least 1 case fan and 1 cpu cooler fan. If you don't have adequate cooling then your system will shut itself down when the cpu gets too hot. I've seen this a lot when someone builds a system with no case fan, and it usually gets about 30-50% into loading windows before the system powers itself down.
SOURCE: How to open the case
Go to this link and choose your form factor to get the steps to open up the tower.
http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/index.htm
Please rate if the answers your question.
Thanks
Keshey
SOURCE: Windows 7 drivers for Optiplex GX620
for drivers u visit driversdownload.com, register and then dowload required drivers for ur comp. i doubt ur computer is affected with virus. pls check it also
SOURCE: for save old bios and install new bios Dell
If you are looking to update your BIOS then you can obtain the latest version from Dell. There should also be a step by step guide on how to correctly perform the upgrade. However, unless there is a real need to upgrade your BIOS then you should not have to do this. I have worked on and custom built several PC's and have never had to update the BIOS.
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