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Screen Flashing At Startup

Discussion in 'PC Hardware' started by andsaw, 2015/02/26.

  1. 2015/02/26
    andsaw

    andsaw Well-Known Member Thread Starter

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    Im getting this flashing when PC starts up and goes to desktop, with nothing else switched on its its ok but when my TV is on that's when i get the flashing, i think its something to do with the graphic card or settings within.

    I tried a different socket on the TV and it started flashing again so its definitely something to do with the HDMI, there's nothing wrong with the cable, as it works perfectly, and using onboard graphics.

    I have done a video of it and hope someone can tell me whats going on and how to rectify it, or if there is nothing to worry about, can be found here,

    http://s1177.photobucket.com/user/andsaw/library/computer
     
  2. 2015/02/27
    Arie

    Arie Administrator Administrator Staff

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    Do you have the same problem if you use a monitor? It could be your TV.
     
    Arie,
    #2

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  4. 2015/02/27
    andsaw

    andsaw Well-Known Member Thread Starter

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    The video is my monitor, that's where its happening, the problem happens when the TV is on and then i start the PC up, it starts flashing on the monitor.
     
  5. 2015/02/27
    Bill

    Bill SuperGeek WindowsBBS Team Member

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    You need to find another monitor or TV that accepts computer input and see if it happens there too. This is essential to isolate the problem and determine if the TV is having problems syncing with your computer's graphics solution, or if your computer's graphics solution is not able to sync with the TV properly.

    Once it boots completely, does the flashing stop?

    It may be a problem with HDMI but again, without trying a different TV/monitor, you will NEVER know if the problem is on the TV end or computer end of the cable.

    If your TV and card both support DVI and/or D-Sub (standard VGA) you might try them and see what happens. But you will also then need to run a separate audio cable too to get sound.
     
    Bill,
    #4
  6. 2015/02/27
    andsaw

    andsaw Well-Known Member Thread Starter

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    I cant try till later, but just to clear it up a bit, when the TV is on, but not switched on to the HDMI input channel for the PC, so its just connected to my set top box which is HDMI and with TV stations showing, and showing nothing from the PC, the monitor will flash when the PC starts up and will stop like it shows in the video and wont do it again.

    When the TV is off, i get no flashing on the monitor when the PC starts up, its like the PC is seeing the TV connected through the HDMI when the tv is switched on and its sorting a process or applying some settings in the graphics to prepare for when i switch the desktop view to the TV, i think this explanation tries to clarify it a bit better.
     
  7. 2015/02/27
    Bill

    Bill SuperGeek WindowsBBS Team Member

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    I agree this looks to be an HDMI issue, but again, without trying a different monitor/TV there is no way of telling if the TV is having issues or the computer is.

    FTR, IMO HDMI has NEVER worked properly when used with computers. :( HDMI was forced onto the computer industry by the home entertainment electronics industry - primarily by the major TV makers who just happen to be the major computer monitor makers too.

    I can understand them not wanting to support two digital formats (HDMI and DVI). But they have done a lousy job of implementing it.
     
    Bill,
    #6
  8. 2015/02/28
    andsaw

    andsaw Well-Known Member Thread Starter

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    Tried with a different monitor (VGA only) and got the same problem with TV on, havnt got another TV to try but will try to borrow one.

    I got MS update and installed it and restarted the PC and it didn't flash when it restarted with TV on, so it only applies to when i start the PC from a main power on and not a restart.
     
  9. 2015/03/01
    Bill

    Bill SuperGeek WindowsBBS Team Member

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    There typically will be some "flashing" during boots as the graphics solution and monitor begin the "handshaking" process of syncing up and settling on digital or analog and the basic and higher resolutions. But yours seems excessive. During a restart, the monitor probably does not have time to go into sleep mode so it is ready to go. But when the computer is totally off, the monitor goes to sleep (or maybe you turn it off manually) so the handshaking is taking longer.

    Still looks like the problem is on the computer side to me.
     
    Bill,
    #8
  10. 2015/03/27
    andsaw

    andsaw Well-Known Member Thread Starter

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    I borrowed a telly and tried to replicated the problem, but did not show the problem that i get on my telly, i tried 2 other cables and could not replicate it, so, it must be something on my telly's HDMI connection, but i have no idea as to fix it.
     
  11. 2015/03/27
    Bill

    Bill SuperGeek WindowsBBS Team Member

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    I know of no way to fix this. HDMI is great at eliminating the rat's nest of cables behind a home theater setup but when it comes to syncing up devices, it really has a hard time.

    The only alternative I can suggest is not use HDMI, but instead, use DVI if available.
     
  12. 2015/03/27
    andsaw

    andsaw Well-Known Member Thread Starter

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    Unfortunately my tv doesn't have DVI only HDMI, VGA and component connections and usb, can you say what exactly is going on, if there is something specific i can have a look on the web.
     
  13. 2015/03/27
    Bill

    Bill SuperGeek WindowsBBS Team Member

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    Other than ensuring you have the latest drivers for your graphics solution, I don't know what else to suggest. Sorry.
     
  14. 2015/04/28
    Athlonite

    Athlonite Inactive

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    try looking at the resolution and refresh rate of the TV and the monitor it sounds like they're being set wrong if you boot the computer with just the monitor and then turn on the TV does it still happen
     
  15. 2015/04/28
    Bill

    Bill SuperGeek WindowsBBS Team Member

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    The resolution and refresh rates are not set until way past POST and the boot drive is finally accessed, and then the essential drivers are loaded.

    Note the OP said,
    Since it is fine on the second TV, it does not suggest a resolution or refresh problem - but again, points to [rather common] HDMI sync delays.
     
  16. 2015/04/28
    andsaw

    andsaw Well-Known Member Thread Starter

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    I agree with Bill, its something inside my TV that does not like syncing with the PC via the HDMI.
     

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