<![CDATA[iFixit - Answers With Device "Dell Desktop Optiplex 390 and Others"]]> https://www.ifixit.com/Answers/Device/Dell_Desktop_Optiplex_390_and_Others?rss=yes en-US Sun, 19 Jul 2026 03:30:39 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Desktop PC will not boot up (blinking orange light)]]> The slow blinking orange light will go on for hours but the system will not boot up.

I unplugged all the cables and plugged it back, but still didn't work.

⟐ Answered February 25, 2026 at 11:36 MST

]]> https://www.ifixit.com/Answers/View/801138/Desktop+PC+will+not+boot+up+(blinking+orange+light) https://www.ifixit.com/Answers/View/801138 Wed, 25 Feb 2026 11:36:34 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Why is my computer is restart again amd again]]> My pc is restart while starting

Quickly auto restare in 3 sec

⟐ Commented June 18, 2026 at 2:48 MST

]]> https://www.ifixit.com/Answers/View/791608/Why+is+my+computer+is+restart+again+amd+again https://www.ifixit.com/Answers/View/791608 Thu, 18 Jun 2026 02:48:06 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Why is the boot button turning blue but then turns orange]]> Whenever i turn on my optiflex it says "low power mode" and i have a feeling it has something to do with the cmos battery, i tried to take it out and put it back in and some more stuff, but i need a solution

⟐ Answer accepted June 22, 2025 at 10:26 MST

]]> https://www.ifixit.com/Answers/View/904466/Why+is+the+boot+button+turning+blue+but+then+turns+orange https://www.ifixit.com/Answers/View/904466 Sun, 22 Jun 2025 10:26:47 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: My pc is showing the numbers 1 and 3 when I turn it on]]> If I turn on my pc the numbers 1 and 3 are there and it's shows "no vga cable" and doesn't turns on. if it manages to turn on the screen becomes pixelated and the fan doesn't seem to work,starts and then shuts. So please share any solutions regardings it.

⟐ Commented April 07, 2025 at 20:51 MST

]]> https://www.ifixit.com/Answers/View/893641/My+pc+is+showing+the+numbers+1+and+3+when+I+turn+it+on https://www.ifixit.com/Answers/View/893641 Mon, 07 Apr 2025 20:51:26 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Some rats had peed on motherboard.]]> Some rats had peed on my motherboard and after that there is no display on screen. How do I clean that PC motherboard.

⟐ Answer edited September 14, 2023 at 7:32 MST

]]> https://www.ifixit.com/Answers/View/813724/Some+rats+had+peed+on+motherboard. https://www.ifixit.com/Answers/View/813724 Thu, 14 Sep 2023 07:32:31 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Wifi is not connected my pc]]> Wifi is not connected my pc

⟐ Answer edited September 01, 2023 at 16:34 MST

]]> https://www.ifixit.com/Answers/View/810673/Wifi+is+not+connected+my+pc https://www.ifixit.com/Answers/View/810673 Fri, 01 Sep 2023 16:34:12 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: My PC is not starting.]]> My PC's SMPS (power supply) is working properly and cleaned RAM then also my PC is not starting. Green light is stable in PC, monitor is also in good condition.

⟐ Answer edited August 08, 2025 at 10:53 MST

]]> https://www.ifixit.com/Answers/View/808676/My+PC+is+not+starting. https://www.ifixit.com/Answers/View/808676 Fri, 08 Aug 2025 10:53:34 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: How to connect the power supply]]> How to connect the power supply

⟐ Answer accepted January 22, 2026 at 8:25 MST

]]> https://www.ifixit.com/Answers/View/933432/How+to+connect+the+power+supply https://www.ifixit.com/Answers/View/933432 Thu, 22 Jan 2026 08:25:43 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Why my dell optiplex 390 not POSTing]]> i found this pc in my basement and tried powering it on. the pc powers on but giving nothing on the monitor is not shoving any numbers on the front panel or any blinking LED. i tried fix it yourself and found that this pc has intel celeron. thank you for help.

⟐ Answered December 08, 2025 at 2:37 MST

]]> https://www.ifixit.com/Answers/View/929566/Why+my+dell+optiplex+390+not+POSTing https://www.ifixit.com/Answers/View/929566 Mon, 08 Dec 2025 02:37:12 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Why is my miracast not working?]]> this device doesn't support Miracast so you can't project to it wirelessly

⟐ Commented April 21, 2025 at 13:48 MST

]]> https://www.ifixit.com/Answers/View/896989/Why+is+my+miracast+not+working https://www.ifixit.com/Answers/View/896989 Mon, 21 Apr 2025 13:48:51 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: My computer freezes during starting]]> The computer turns on normally but freezes at the 1 and 3 yellow light

⟐ Answered November 25, 2024 at 7:37 MST

]]> https://www.ifixit.com/Answers/View/878249/My+computer+freezes+during+starting https://www.ifixit.com/Answers/View/878249 Mon, 25 Nov 2024 07:37:06 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Due to voltage fluctuation pc stopped working.]]> There was huge voltage change one day, fans tv got burned and this pc also, can it be repaired, what part of it should removed and replaced?

⟐ Edited February 25, 2024 at 4:08 MST

]]> https://www.ifixit.com/Answers/View/838437/Due+to+voltage+fluctuation+pc+stopped+working. https://www.ifixit.com/Answers/View/838437 Sun, 25 Feb 2024 04:08:46 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Mon ordinateur dell optiplex 380 ne marche plus]]> Tt est eteins l ordinary ne marche plus

Google translate:

My dell optiplex 380 computer no longer works

Everything is turned off, computer no longer works

⟐ Answer edited December 13, 2023 at 23:43 MST

]]> https://www.ifixit.com/Answers/View/828315/Mon+ordinateur+dell+optiplex+380+ne+marche+plus https://www.ifixit.com/Answers/View/828315 Wed, 13 Dec 2023 23:43:39 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: USB port not working properly it fluctuate]]> usb port fluctuate

⟐ Commented September 17, 2024 at 21:42 MST

]]> https://www.ifixit.com/Answers/View/869853/USB+port+not+working+properly+it+fluctuate https://www.ifixit.com/Answers/View/869853 Tue, 17 Sep 2024 21:42:30 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: My PC is not working]]> My PC is not working

⟐ Commented June 03, 2024 at 17:45 MST

]]> https://www.ifixit.com/Answers/View/852674/My+PC+is+not+working https://www.ifixit.com/Answers/View/852674 Mon, 03 Jun 2024 17:45:15 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Why is my computer display not working?]]> My computer display is not working despite the CPU start up being normal. Checked all the cables and even tried a different monitor , but the issue persisted. This is a recurring problem which usually resolves on cleaning the RAM slot, but this time it didn't work.

Anyone who can help please?

⟐ Answered June 02, 2024 at 22:05 MST

]]> https://www.ifixit.com/Answers/View/852494/Why+is+my+computer+display+not+working https://www.ifixit.com/Answers/View/852494 Sun, 02 Jun 2024 22:05:55 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: desktop 390 hard drive not working]]> Dell i5 desktop 390 hard drive not working

⟐ Edited October 20, 2023 at 7:52 MST

]]> https://www.ifixit.com/Answers/View/820158/desktop+390+hard+drive+not+working https://www.ifixit.com/Answers/View/820158 Fri, 20 Oct 2023 07:52:49 -0700 <![CDATA[Dell Desktop Optiplex 390 and Others: Cpu working but no display on screen.]]> Some days before, my PC was in my room and some rats gone in my CPU and do toilet on motherboard then after I am facing this problem.

⟐ Answered October 20, 2023 at 7:48 MST

]]> https://www.ifixit.com/Answers/View/810586/Cpu+working+but+no+display+on+screen. https://www.ifixit.com/Answers/View/810586 Fri, 20 Oct 2023 07:48:06 -0700