Blank screen before Login

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  1. f14tomcat's Avatar
    Posts : 53,178
    Multi-boot Windows 10 - RTM, RP, Beta, and Insider

    Jim177 said:
    Well, the Cmos Battery has been replaced, but I still have a black screen on startup. If I reset the Desktop PC once I get to the screen where I can login after hitting the space bar once. I took some pics of the Bios settings on my iPad but I have to figure out how to transfer them to Windows. I'll forward them if that will help.
    If you can't find a quick and easy transfer method iPad>Windows, just email them to yourself.
      My Computers

  2. Posts : 18
    Windows 10
    Thread Starter

    CMOS Battery

    Okay here are the two BIOS files I most worry about. Power & Boot. Note that I can't seem to make my PC wake up and I'm not sure that I have things set right under the Power Menu. Note that I have UEFI boot enabled in Boot Menu, but I'm not sure if I have to disable one of the other items. Fast boot is turned off. Let me know if bios files were uploaded.
    Thanks for the help
    Attached Thumbnails Attached Thumbnails Blank screen before Login-bios-prof..jpg   Blank screen before Login-bios-boot.jpg   Blank screen before Login-bios-pwr..jpg  
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  3. PeterPan2000's Avatar
    Posts : 58
    Windows 10 pro, 64 bit

    Sorry Jim. Unfortunately this kind of troubleshooting means checking the more typical problems, and the cmos battery was a real suspicion. Good on you learning to disassemble down to the motherboard to get to the battery, if that's what you had to do. So at this point, forgive my partial knowledge, but I'm just trying to be helpful. As I understand it, The UEFI setting infers that your hard drive uses what is called GUID partition table, as opposed to a more common (at least from my time on my old machines) a Master Boot Record (MBR) on the hard drive. I'm going to guess that at some point (don't ask my how this could happen) if you had a hard drive set up with that GUID partition table, and it somehow got switched to an MBR, then its possible the bios would see that, and switch off your EUFI setting.

    So that said, if it were me, I would try to use a disk examination and recovery tool, to at least make sure of what the drive's format actually is. There's a very powerful tool called (of all things) "Minitool Partition Wizard" (Google iT) , which has become my "go to" tool for disk management. It's free version will do an awful lot at no cost. for one thing as you run it, it will show every drive in your system, and immediately show whether or not each disk has an MBR (master boot record). If it does, then as I said it makes sense that your bios would switch off the UEFI option. BUT... if the tool does show your system disk has a GUID partition table, then its starting to sound like that partition table may be damaged!

    As I'm not very familiar with disks set up for a GUID partition table, I can't begin to offer advise on how to fix it. The fact that after a second boot you are able to log in means at least your system is intact, and the bios is somehow making its way through the inconsistency. But maybe someone else can offer some guidance on repair. Its quite possible the "Minitool Partition Wizard" I mentioned may offer some help, but I've only dealt with MBR disks myself, so I don't know.

    Good luck. I'll be watching the thread because I'm sure I'll have to deal with a similar problem eventually.
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  4. Posts : 18
    Windows 10
    Thread Starter

    This issue is still ongoing. The CMOS battery was replaced. But every time I shutdown my PC, I get the blank screen on startup. I noted that the motherboard show double 00, which means that it complete the boot. But then if I hit the PC front reset button once it boots to the windows 10 splash screen. I them press the space bar, then enter my password and it will boot into Windows 10. This works 99% of the time. So I still want to fix this.
      My Computer

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