weird screen B450M pro 4 after MBT2GPT

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   Introduction.

I am building a new pc, and MBR2GPT most likely has messed something up.

I was already installing the OS, WIN 10 and openSUSE leap 15.1.

Two different hard-disk.

Linux install went fine, but not the windows install.

Linux was EUFI as I want it, but windows was installed with an MBR.

With Google I found a tool from Microsoft. MBR2GPT   

Now the problem, after using this tool (ty MS) , I get a weird distorted screen, when I turn on the pc.

I then went into the bios, and selected load UEFI default.
This seemed to work as in the weird screen being gone, but as soon as I do CSM diabled, that screen returns.

This weird screen started after using the tool, to convert from mbr to uefi.

So I turn on the pc (no os installed) and I get a weird screen, then the asrock logo appears (with a countdown to press what key to enter the bios) , sometimes also distorted. 

Any ideas on what's wrong and how to fix it ? 

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Gps Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Oct 2019 Location: Amsterdam Status: Offline Points: 7	Post Options Post Reply Quote Gps Report Post Thanks(0) Quote Reply Topic: weird screen B450M pro 4 after MBT2GPT Posted: 23 Oct 2019 at 10:29pm
	Introduction. I am building a new pc, and MBR2GPT most likely has messed something up. I was already installing the OS, WIN 10 and openSUSE leap 15.1. Two different hard-disk. Linux install went fine, but not the windows install. Linux was EUFI as I want it, but windows was installed with an MBR. With Google I found a tool from Microsoft. MBR2GPT Now the problem, after using this tool (ty MS) , I get a weird distorted screen, when I turn on the pc. I then went into the bios, and selected load UEFI default. This seemed to work as in the weird screen being gone, but as soon as I do CSM diabled, that screen returns. This weird screen started after using the tool, to convert from mbr to uefi. So I turn on the pc (no os installed) and I get a weird screen, then the asrock logo appears (with a countdown to press what key to enter the bios) , sometimes also distorted. Any ideas on what's wrong and how to fix it ?

Gps Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Oct 2019 Location: Amsterdam Status: Offline Points: 7	Post Options Post Reply Quote Gps Report Post Thanks(0) Quote Reply Posted: 24 Oct 2019 at 6:52am
	I managed to make a photo. https://imgur.com/hQ8TYur

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 27728	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 24 Oct 2019 at 1:28pm
	Disconnect the system from power and pull the CMOS battery for 20min or so for a full CMOS/RTC clear. If the MS tool changed any deep (hidden) UEFI values that should clear them and get things back to normal. Edited by Xaltar - 24 Oct 2019 at 1:30pm


Gps Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Oct 2019 Location: Amsterdam Status: Offline Points: 7	Post Options Post Reply Quote Gps Report Post Thanks(0) Quote Reply Posted: 24 Oct 2019 at 6:58pm
	Thank you.

Gps Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Oct 2019 Location: Amsterdam Status: Offline Points: 7	Post Options Post Reply Quote Gps Report Post Thanks(0) Quote Reply Posted: 28 Oct 2019 at 6:58am
	I have for now given up on the pre post screen. Resetting the bios did not change a thing. If I boot UEFI only, I get this screen, if I have CSM enabled all seems normal. Because after this screen all seems fine, for now I gave up on fixing it. Unless somebody here has a clue on whats happening. Tried a different monitor, different connection, same thing.

Gps Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 Oct 2019 Location: Amsterdam Status: Offline Points: 7	Post Options Post Reply Quote Gps Report Post Thanks(0) Quote Reply Posted: 07 Nov 2019 at 1:35am
	That weird screen was getting on my nerves. I went into the bios and enabled csm. For now I am totally happy, both Linux and windows 10 still boot fine, no more weird screen, when I turn on pc. I hate EUFI though, for all the headache it has given me. But for now all seems fine, both win 10 pro and Linux are installed using UEFI and no weird screens. Still don't understand the weird screen even with only windows 10 installed and csm disabled, but lets hope this is my last post on the subject.