+ Post New Thread
Results 1 to 11 of 11
Hardware Thread, Computer won't switch on in Technical; Hi We have a computer which will not switch on. Having looked inside the motherboard LED is green when power ...
  1. #1

    Join Date
    Jun 2010
    Posts
    38
    Thank Post
    28
    Thanked 0 Times in 0 Posts
    Rep Power
    0

    Computer won't switch on

    Hi

    We have a computer which will not switch on.

    Having looked inside the motherboard LED is green when power is supplied. When plugging the power in to the back of the machine the fan spins for a second or so and then it goes off.

    I have made sure all power connections are firmly in place on the motherboard, I have removed all external devices which where attached (e.g. mouse, keyboard etc) but still no joy. I have also tried unplugging frontal USB and audio ports etc to see if this makes any difference, but still nothing.

    I was hoping someone may be able to offer some advice.

    Thanks
    Andy

  2. #2

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,821
    Thank Post
    272
    Thanked 1,140 Times in 1,036 Posts
    Rep Power
    351
    Try removing the power switch connector from the motherboard and with a screwdriver touch the two pins together. If you have power it might just be a dodgy switch.

    Although I have seen a machine do similar when the motherboard was broken.
    Last edited by glennda; 19th November 2012 at 03:34 PM.

  3. Thanks to glennda from:

    andyk (19th November 2012)

  4. #3

    Join Date
    Oct 2007
    Location
    Newcastle Upon Tyne
    Posts
    466
    Thank Post
    153
    Thanked 68 Times in 59 Posts
    Rep Power
    44
    Just to make clear.. the "power switch" connector, not to be confused with the acutal power connector

  5. Thanks to TronXP from:

    andyk (19th November 2012)

  6. #4

    LosOjos's Avatar
    Join Date
    Dec 2009
    Location
    West Midlands
    Posts
    5,768
    Thank Post
    1,510
    Thanked 1,294 Times in 884 Posts
    Rep Power
    813
    Sounds like a dead PSU to me - had this happen to my brother's PC. There's enough power to light the LED's but not enough to post. Try a new PSU (or at least a known working one from another machine)

  7. Thanks to LosOjos from:

    andyk (19th November 2012)

  8. #5

    Join Date
    Jun 2010
    Posts
    38
    Thank Post
    28
    Thanked 0 Times in 0 Posts
    Rep Power
    0
    Hi Everyone

    Thanks for all your help, will give each suggestion a go.

    Cheers
    Andy

  9. #6


    Join Date
    Sep 2007
    Location
    UK
    Posts
    5,463
    Thank Post
    1,462
    Thanked 892 Times in 573 Posts
    Rep Power
    647
    If you can swap the power supply, that's a good first step. The other thing you could try is to disconnect power to all of the peripherals and see if it tries to boot. If it does, then connect the boot HDD and see if it works. It could be the psu falls over when it has to big a load.

  10. #7

    glennda's Avatar
    Join Date
    Jun 2009
    Location
    Sussex
    Posts
    7,821
    Thank Post
    272
    Thanked 1,140 Times in 1,036 Posts
    Rep Power
    351
    Quote Originally Posted by TronXP View Post
    Just to make clear.. the "power switch" connector, not to be confused with the acutal power connector
    sorry yeah i'll edit my post!

  11. #8

    twin--turbo's Avatar
    Join Date
    Jun 2012
    Location
    Carlisle
    Posts
    2,334
    Thank Post
    1
    Thanked 381 Times in 340 Posts
    Rep Power
    151
    Check the rear USB for damage.

    Rob

  12. Thanks to twin--turbo from:

    andyk (19th November 2012)

  13. #9
    cpjitservices's Avatar
    Join Date
    Jul 2010
    Location
    Hessle
    Posts
    2,605
    Thank Post
    544
    Thanked 301 Times in 277 Posts
    Rep Power
    85
    I know exactly what this is... it's a case of a dead motherboard I'm afraid the symptoms you describe are the ones of a motherboard shorting... could be some solder somewhere.

    By all means grab another PSU from somewhere and try that but I reckon it's the motherboard shorting out.

    I used to build PC's and have come across this many many times, especially when someone brought me a machine they had built and had put the motherboard directly into the case without using the mountings.

  14. #10

    LosOjos's Avatar
    Join Date
    Dec 2009
    Location
    West Midlands
    Posts
    5,768
    Thank Post
    1,510
    Thanked 1,294 Times in 884 Posts
    Rep Power
    813
    Quote Originally Posted by cpjitservices View Post
    especially when someone brought me a machine they had built and had put the motherboard directly into the case without using the mountings.
    That's a site to behold - the crack, the flash, the smoke and the look of sheer dread in the perps face, priceless! (actually, about £150 in my mate's case!)

  15. #11
    cpjitservices's Avatar
    Join Date
    Jul 2010
    Location
    Hessle
    Posts
    2,605
    Thank Post
    544
    Thanked 301 Times in 277 Posts
    Rep Power
    85
    Actually as luck would have it... I removed the board - screwed in the mountings and screwed the board in PROPERLY into the mountings... LUCKILY the board fired up and was working - How said friend didn't fry the board is uncanny, especially since they tried to power it on over and over and over and over.....

    so was just a £30 labour fee to basically rebuild but with mountings this time



SHARE:
+ Post New Thread

Similar Threads

  1. Canon PowerShot A80 won't switch on
    By Dos_Box in forum AV and Multimedia Related
    Replies: 2
    Last Post: 7th September 2012, 12:57 AM
  2. pc won't log on to network
    By IA76 in forum Wireless Networks
    Replies: 5
    Last Post: 20th January 2009, 10:09 AM
  3. Pars and Pars .net won't work on curric domain
    By dezt in forum MIS Systems
    Replies: 5
    Last Post: 5th September 2007, 01:40 PM
  4. Replies: 2
    Last Post: 11th January 2007, 03:39 PM
  5. Windows update won't work on 2000 pro
    By woody in forum Windows
    Replies: 4
    Last Post: 22nd December 2006, 09:59 AM

Thread Information

Users Browsing this Thread

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

Tags for this Thread

Posting Permissions

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