iFixit - Answers With Device "Dell OptiPlex 755"

Dell OptiPlex 755: Blinking Orange Light Only

Thu, 21 Dec 2017 18:51:11 -0700

Hi Guys any Idea why my Desktop can't power on.. when I push the power button. it only blinks.. and the color is Orange... I try to reseat the Power Supply, and Memory nothing happens.. please help guys.. thank you.

⟐ Answer accepted December 21, 2017 at 18:51 MST

Dell OptiPlex 755: Adding a video card

Tue, 15 Feb 2022 16:46:44 -0700

What video cards can I use to upgrade my system

⟐ Commented February 15, 2022 at 16:46 MST

Dell OptiPlex 755: Computer fails to come on.

Tue, 12 Dec 2023 03:27:35 -0700

The computer was shut down and the power turned off. When I turned the power back on the computer would no come on. Power cord is ok and has power up to back of machine.

⟐ Answered December 12, 2023 at 3:27 MST

Dell OptiPlex 755: What happened to my presentation?

Thu, 18 Jan 2018 14:23:14 -0700

Partners sent me several presentations for correction and editing, and after three days of work one of them at startup gives an error: “This file is not in a recognizable format”

it's such a nuisance, who can tell something?

⟐ Answer deleted January 18, 2018 at 14:23 MST

Dell OptiPlex 755: Why RAM is not supporting by my Dell optiplex pc?

Thu, 18 Apr 2024 17:42:22 -0700

I have Dell optiplex 990 with 4 GB of RAM. I bought more 4 GB to increase the RAM capacity. I bought same DDR3 RAM but after plugging in system won't start. With my old RAM its working but not working with new RAM. Just moving the fan and stops.

Shopkeeper has rechecked the new one RAM and that is working fine on other PC. What should i do?

⟐ Answer accepted April 18, 2024 at 17:42 MST

Dell OptiPlex 755: How to fix power save mode

Mon, 01 Jun 2020 17:12:03 -0700

I trying to open but if keep saying “ enter power save mode

⟐ Answer edited June 01, 2020 at 17:12 MST

Dell OptiPlex 755: still. registered to previous owner . don't work.!?

Thu, 23 Jan 2020 00:10:06 -0700

Refurbish bought wall mart never worked

⟐ Answer accepted January 23, 2020 at 0:10 MST

Dell OptiPlex 755: lots of water damage!

Wed, 24 Jan 2018 15:34:00 -0700

My little brother found a PC outside and it is POURING out

I need to do mass water damage removal. any ideas?

⟐ Edited by author January 24, 2018 at 15:34 MST

Dell OptiPlex 755: Why not working in sound system of my computer?

Fri, 31 Mar 2017 23:50:51 -0700

My computer is shown the sentence ,This version of Audio Esp is not intended not for this operating system.I am not hear any sound.

⟐ Commented March 31, 2017 at 23:50 MST

Dell OptiPlex 755: Windows won’t start, startup repair cannot repair automatically.

Fri, 20 Jul 2018 15:51:25 -0700

First off, I have a Dell Optiplex 990 - Windows 7 Pro, which wasn’t listed...not a 775. Worked fine last night, no changes to hardware or software, shutdown normally without issues. Today, will not load windows.

Startup repair cannot repair this computer automatically.

Problem Signature:

Problem Event Name: StartupRepairOffline

Problem Signature 01: 6.1.7600.16385

“ “ 02: 6.1.7600.16385

“ “ 03: unknown

“ “ 04: 21198191

“ “ 05: AutoFailover

“ “ 06: 10

“ “ 07: NoRootCause

OS Version: 6.1.7600.2.0.0.256.1

Locale ID: 1033

Tried to restore from previous known good restore point and Windows fails before I can get there.

Fails when attempting to boot in safe mode, with networking, and with command prompt.

I don’t have a disc as I bought the pc used, but I have a bootable Windows 7 Pro usb that I can boot from.

Tried rebuild boot command found in other threads, it says it finds 0 copies of Windows.

I could completely reload windows, but most foolishly my restore points are only in Windows. I have most or my important info backed up on external hard drive, but most foolishly, I don’t believe I have any restores backed up outside of the internal drive.

Hopefully there is a Windows wizard who can give me advice to work a little magic and give me the opportunity to save an off-site restore from now on. I have a lot of big programs I really would rather not have to spend the time reinstalling if possible.

Thanks in advance for any help.

⟐ Reopened July 20, 2018 at 15:51 MST

Dell OptiPlex 755: Power problems on Dell 755

Fri, 31 May 2024 11:24:28 -0700

My power supply "blew up" so I went onto eBay and got another, have fitted this one and the computer ran fine for 2 days but now it refuses to start, all I've got is a blinking amber light on the front and the monitor saying it's in Power Save Mode

⟐ Answered May 31, 2024 at 11:24 MST

Dell OptiPlex 755: Blue screen bios error

Sat, 22 Jul 2023 23:59:02 -0700

How do I stop blue screen error 0x000000f4?

⟐ Answer unaccepted July 22, 2023 at 23:59 MST

Dell OptiPlex 755: Blue screen bios error

Fri, 21 Jul 2023 20:29:22 -0700

How to stop blue screen error. 0x000000F4?

⟐ Marked as duplicate July 21, 2023 at 20:29 MST

Dell OptiPlex 755: Why is my computer doesn't display on the monitor

Tue, 30 May 2023 01:48:39 -0700

my Dell OptiPlex 755 doss not display, the windows logo will appear on the screen and gos off blank screen

⟐ Commented May 30, 2023 at 1:48 MST

Dell OptiPlex 755: My computer wont display

Tue, 30 May 2023 01:28:48 -0700

the windows logo comes on and stop display on the monitor

⟐ Marked as duplicate May 30, 2023 at 1:28 MST

Dell OptiPlex 755: Porque al conectar mi PC, en el monitor dice que no hay señal de entra

Thu, 16 Oct 2025 19:03:27 -0700

``***''

''***``

⟐ Answer edited October 16, 2025 at 19:03 MST

Dell OptiPlex 755: On but showing no boot device available

Wed, 16 Jul 2025 07:51:51 -0700

On but showing no boot device available

⟐ Answered July 16, 2025 at 7:51 MST

Dell OptiPlex 755: Pc speed is very slow

Sat, 01 Jun 2024 22:55:53 -0700

My PC speed is very slow

⟐ Answered June 01, 2024 at 22:55 MST

Dell OptiPlex 755: Why is my fan making noise when I turn on the power button

Fri, 16 Feb 2024 11:33:15 -0700

the fan of my computer is making a strage sound when I'm starting to turn the power on , I need assistance on how to fix it

⟐ Commented February 16, 2024 at 11:33 MST

Dell OptiPlex 755: No boot device available

Mon, 14 Aug 2023 17:59:30 -0700

My computer will not start up. Cannot find boot device. What is most likely cause?

⟐ Answer edited August 14, 2023 at 17:59 MST