Dell optiplex 790 driver for windows 7 - Dell OptiPlex GX270 PC Desktop

http://www.bing.com/search?q=optiplex+790+diagnostic+lights&qs=AS&sk=AS3&pq=optiplex+790+&sc=8-13&sp=4&cvid=658fd46fab43480faa76aa4f316ba572&FORM=QBRE

optiplex 790 diagnostic lights Bing

Hello there
I have found two things which will help you.
A Technical Guide to the Optiplex 790 which will download from here:
http://www.dell.com/downloads/global/products/optix/en/optiplex-790-tech-guide.pdf
It is in pdf format and can be saved to your computer for future reference.
Also I found a Service Manual here:
Dell OptiPlex 990 Desktop Service Manual Page 76
If you click on the green download button at the top of the page then you will taken to a page where you enter 3 letters that are given to you and you can then opt to download it or view in your browser. In both cases it can be saved to your computer.
The latter has a good section on beep codes, and light codes on page 73 ( Chap 20) and following.
It gives your 2-3-4 as a possible USB failure, so try booting with no USB items attached - printer, flash drive, scanner, external drive etc.
It gives your 1-2 code as an expansion card failure and gives various means of checking.
Hope this is helpful, if so would you please register that with Fixya
Cheers

Replace the CPU fan. Available at all computer parts location.

the optplex 620 doesn't meet the windows 7 requirements but would run as you have found. your options would be to add newer pci soundcard
or try the windows 7 or vista, driver from http://www.radarsync.com/drivers/id282355/soundmax_integrated_digital_hd_audio_driver_for_Windows_7_x64

GL
Jammer

There are no windows 7 drivers available for the OptiPlex SX260 thes are the only drivers for SX260 follow link.


http://www.dell.com/support/drivers/uk/en/ukbsdt1


It is possible however it is difficult to try explain to someone who hasn't a clue how to force windows XP drivers to work with windows 7.

Sm bus controller driver optiplex 780

You will need to visit the Dell website and download the Windows 7 drivers for your computer. Click their downloads/support button.

Take care!
damnor01

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

Unfortunately, Dell doesn't support Windows 7 for the OptiPlex GX260. You could try an older driver and see if it will work, but you can't get any Windows 7 drivers for the GX260. (At least not yet.)

You can view a list of Dell computers that are Windows 7-compatible here:

http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?journalid=8B348DA2BF0BCAC8E040AC0A63E97C5F&docid=364757