20 Most Recent Dell Optiplex 755 Desktop Desktop Computer Questions & Answers


Hi please help me with my Dell optiplex 755 I install Windows 10 now it's not not working the screen becomes blanks on the desktop but I see folders clear the problem is that Usb and keyboard is not working even when I try to do setup it's say Usb and hard drive not present

You can try to attach the drive with a different USB cable to another computer. That way you will rule out connectivity issues and drivers as a possible cause. In case the issue persists, there is a good chance that something wrong with the enclosure or the HDD itself. In both cases, you can: -RMA the drive if under warranty.
4/27/2021 12:50:15 PM • Dell Optiplex... • Answered on Apr 27, 2021

My window media player not play no sounds

You need to download co-decs for your media player and you can fix it.
Go to codecs.com/download/K_lite_codec_pack.htm ">http://www.free-codecs.com/download/K_lite_codec_pack.htm and click on "Download K-Lite Codec Pack." When you are taken to the download page, select "K-Lite Codec Pack 5.5.4 FULL" and download the associated file. 2 Install the Codec pack to your local hard drive. Make sure to select "full installation." You may be prompted to restart your computer when the installation is complete. 3 Run your normal media player; attempt to play the video file suffering from missing sound. If the Codec pack installed correctly and you are using a supported media player, the sound should now function properly.
Thanks. Have a great day.
12/20/2019 7:00:18 AM • Dell Optiplex... • Answered on Dec 20, 2019

Alert ! unsupported memory configuration please

in computers there are many kind of rams a big problems of ram which users are always face is buss speed different. we cant run all type of bus speeds of ram on our computer please replace your ram with the higer bus speed and run it.

and pull out your one ram from your ram bank. i mean to say decrease your ram speed.
10/21/2017 4:06:19 PM • Dell Optiplex... • Answered on Oct 21, 2017

Unsupported memory configuration.please populate dimm1

open it up ..and see what is wrong with the first slot of ram memory ...if the inserted module is not working ...than remove it ..(to check if it works just leave it by itself and try to start the computer ..) anyway ..if there isn't any module in the first slot ..than move one from the last slot ..I mean mount the modules in slots from number 1 to ...as many you have available ...After finish ...restart ..press delete button right the way to go to bios settings ...and in here ..look for optimal factory default settings ..and engage them by selecting with arrows..and enter..and confirm with enter (Y)
to save settings before exit ..press F 10 ..and enter ..
This will assure the ram configuration ...in the correct way ..
Please read careful ..and ask if you do not understand something ...and also ..please rate my answer..cause it helps with my rating and activity on the site..
2/23/2017 8:49:38 AM • Dell Optiplex... • Answered on Feb 23, 2017

How to record with mike input,front input

easy steps check out the solution
12/27/2016 11:47:31 AM • Dell Optiplex... • Answered on Dec 27, 2016

Why is it stuck in auto detect power save mode?

remove Cmos battery for 10 mins, reboot into Bios set dafaults...f10 save and exit
2/13/2016 7:30:11 AM • Dell Optiplex... • Answered on Feb 13, 2016

I/O card parity interrupt at F000:F188. Type ( S

change the RAM. It will work.
1/22/2016 1:14:16 AM • Dell Optiplex... • Answered on Jan 22, 2016

Alert ! unsupported memory configuration

System will not boot without RAM in Memory slot 1
If you have memory in that slot, then remove and re-seat it per the instructions in that link
12/12/2015 7:37:06 AM • Dell Optiplex... • Answered on Dec 12, 2015

How to get the side panel off a dell optiplex 745 desktop

11/6/2015 2:24:31 PM • Dell Optiplex... • Answered on Nov 06, 2015

Does 3d card works in optiplex 755 system?

Yes, 3d carsd will work in your computer, the only thing you have do is check and make sure that the computer can supply the power requirements for the card.
Some of the video cards run off of the system bus, while others require a seperate power lead attached to them, the same way you plug in power to a hard drive.
Both of the major manufacturers ATI, and NVIDIA, both make 3d cards that will work with your system.
The cards are all pci-e , as this is the fastest bandwidth the system provides for expansion cards.

Something else you will want to look at when upgrading, is what operating system you will be running it on.
Some of the lower prices video cards, even though they might support 3d, they may not support directx 11.
This is crucial if you are running Windows 7, because that is the version that 7 runs on.
Vista runs on dx 10, and xp and below can only run up to directx 9.

Just keep this in mind while shopping.
Both Best Buy, and Fry's carry large selections of 3d capable cards, just remember about the power requirements before you buy.

I hope this answers your question, and gives you some ideas as to which kind of card yo get.
10/13/2015 5:34:58 PM • Dell Optiplex... • Answered on Oct 13, 2015

Need to install Win XP

check in setup achi and ata mode change then install
click yes for vote
7/22/2015 5:44:11 PM • Dell Optiplex... • Answered on Jul 22, 2015

After installing xp sp3 can not open web pages

Hi Frank, My name is Pradeep and I work for Dell's Social Media Team. Please start the system in Safe mode with Networking and let us know if you are able to access internet. Go to, Start, Run, type cmd and click OK. Now type ping www.Dell.com. check for packets sent and received. if the loss is zero, then it is issue with web browser. If not, please type the commands below: netsh int ip reset reset.txt netsh winsock reset regsvr32 urlmon.dll regsvr32 softpub.dll ipconfig /flushdns restart the system and let us know the results. Pradeep Lokesh Social Media and Community Professional Order Status: http://del.ly/61822hij Download Drivers: http://del.ly/61832hid
6/21/2015 8:16:29 AM • Dell Optiplex... • Answered on Jun 21, 2015

How to deactivte Computrace R dell bios Please help me

how to remove
11/4/2014 6:28:31 PM • Dell Optiplex... • Answered on Nov 04, 2014

Where are fuses located in optiplex 755

The *ONLY* place inside a desktop computer for a fuse would be inside the power-supply unit. Expressed differently, there are *NO* fuses being used.
10/24/2014 2:11:37 AM • Dell Optiplex... • Answered on Oct 24, 2014

How to desible Dell optiplex 755 Frimware updates

There is no need to "disable" firmware updates. The computer will only accept "valid" updates. So, how would somebody be able to access your computer, in order to try to update the firmware. Prevent access to your computer, and you will have prevented the firmware from being updated.
10/24/2014 2:04:01 AM • Dell Optiplex... • Answered on Oct 24, 2014

How to desible dell frimware bios update

go into your Dell Maintenance program, or whatever it is called in the All Programs list under Dell. If it has updates listed then turn off or change setting so that updates are either not done or require your approval/management. Else, if your model does it thru Windows Update, do not do it! Hope that helps.
10/23/2014 5:35:42 AM • Dell Optiplex... • Answered on Oct 23, 2014

Im in the philippines, just want to ask where to buy i/o panel of dell optiplex 755, because i have one but was recently damaged.

I used google to search for i/o panel of dell optiplex 755 and got his link http://www.discountelectronics.com/product?gclid=CKTSgfHdscECFeHm7AodD1wA3w&product_id=7297&product_model=18
10/16/2014 5:50:43 PM • Dell Optiplex... • Answered on Oct 16, 2014

I have a dell optiplex 755 and it seems the power switch was broken as i checked inside this unit, how to fix it? has anyone encountered the same problem?

yes the power switch is called the i/o panel it connects to the system board of the computer by a wire or ribbon cable. You have to unscrew a screw. HERE IS THE MANUAL LOOK ON PAGE 70 http://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-755_user%27s%20guide_en-us.pdf
10/14/2014 10:28:37 PM • Dell Optiplex... • Answered on Oct 14, 2014

Dell optiplex 755 does not recognize the dvd-rom

Try the fix listed here - the Fix It image.
10/14/2014 2:32:02 PM • Dell Optiplex... • Answered on Oct 14, 2014
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