+ Post New Thread
Results 1 to 8 of 8
Hardware Thread, Changed CMOS battery on a Dell Optiplex now PC won't power up at all in Technical; I've got a Dell Optiplex SX280 that was reporting system voltage low on the CMOS battery. So ordered a new ...
  1. #1
    kaphc's Avatar
    Join Date
    Sep 2009
    Location
    Derbyshire
    Posts
    529
    Thank Post
    143
    Thanked 59 Times in 50 Posts
    Rep Power
    71

    Changed CMOS battery on a Dell Optiplex now PC won't power up at all

    I've got a Dell Optiplex SX280 that was reporting system voltage low on the CMOS battery.

    So ordered a new battery, took out the hard drive very carefully, took out the old battery, put the new one in and reassembled. Found some very helpful online instructions here: Installing Dell Optiplex SX280 Battery - Page 3 - iFixit which I followed.

    But now I have no power to the PC at all - nada. Switching it on at the power button does nothing.

    I've tried swapping the old battery back and that has the same problem - no power at all now.

    Have checked all the obvious things like power cables plugged in at the back of the PC, power cable reconnected to the hard drive etc.

    This is the first time I've changed the battery on a motherboard and I can't help thinking I must have overlooked something? Can anyone point me in the right direction?

  2. #2
    DrPerceptron's Avatar
    Join Date
    Dec 2008
    Location
    In a house
    Posts
    849
    Thank Post
    32
    Thanked 120 Times in 102 Posts
    Rep Power
    37
    What diagnostic lights do you have on the machine?

    Are any of the capacitors fat, bulging or leaking? SX280s are notorious for that.

  3. #3

    mac_shinobi's Avatar
    Join Date
    Aug 2005
    Posts
    9,235
    Thank Post
    2,775
    Thanked 937 Times in 877 Posts
    Rep Power
    343
    Any jumper to clear cmos ?

    If not take the cmos battery out and try and power it on for a few seconds and then power it down and put the cmos battery back in and try and power it back on again ?

  4. #4
    chazzy2501's Avatar
    Join Date
    Jan 2008
    Location
    South West
    Posts
    1,723
    Thank Post
    206
    Thanked 254 Times in 206 Posts
    Rep Power
    65
    These have an external powersupply don't they? change the kettle lead going to the adaptor and check the cable for damage. Also try reconnecting (if you haven't 20 times by now) the plug in the back.

  5. #5
    kaphc's Avatar
    Join Date
    Sep 2009
    Location
    Derbyshire
    Posts
    529
    Thank Post
    143
    Thanked 59 Times in 50 Posts
    Rep Power
    71
    Thanks for the tips .... had to move on and look at something else in the end yesterday but I'll take another look at this later and see what I can see - not sure about what jumpers there were off the top of my head nor the state of the capacitor but I'll investigate.

  6. #6

    Join Date
    Jan 2009
    Posts
    92
    Thank Post
    6
    Thanked 22 Times in 19 Posts
    Rep Power
    14
    The academy I used to work in had the Optiplex-745 which also had the external power pack. They are known for their unreliability. Even if the light on the power pack is green, disconnect the kettle lead, wait 30 seconds for everything to discharge (for good measure, unplug the lead to the machine as well) plug it all back in, and the machine should fire-up okay.

    The real pain we used to have were our power-packs had been built into the academy's furniture and so to do this we would have to take furniture apart!

  7. #7

    twin--turbo's Avatar
    Join Date
    Jun 2012
    Location
    Carlisle
    Posts
    2,334
    Thank Post
    1
    Thanked 381 Times in 340 Posts
    Rep Power
    149
    I had an SX running my MythTV till it stoped posting. gave up on it and sold it.

    Does it power on at all?

    Rob

  8. #8
    kaphc's Avatar
    Join Date
    Sep 2009
    Location
    Derbyshire
    Posts
    529
    Thank Post
    143
    Thanked 59 Times in 50 Posts
    Rep Power
    71
    No there's nothing power at all, no lights, not even a fan whirring or anything. I might be able to try swapping the power pack but the leads are all cable managed into a tray underneath the desks and so it's like a mass of spaghetti to untangle!

SHARE:
+ Post New Thread

Similar Threads

  1. New Dell Optiplex 780 USFF Now Available
    By SYSMAN_MK in forum Hardware
    Replies: 4
    Last Post: 11th December 2009, 12:07 PM
  2. Duplicate GUID on Dell Optiplex GX620
    By Dos_Box in forum Hardware
    Replies: 3
    Last Post: 11th May 2009, 02:37 PM
  3. CMOS battery on laptop
    By ranj in forum Hardware
    Replies: 9
    Last Post: 6th May 2009, 07:51 PM
  4. Replies: 9
    Last Post: 19th June 2008, 11:17 AM
  5. Dell Optiplex Voltage Stepper Change Prevention
    By DaveP in forum How do you do....it?
    Replies: 2
    Last Post: 22nd November 2006, 08:12 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •