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title: GUI troubleshooting
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---
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## Can't click on anything after connecting 4k external display
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## Can't click on parts of the screen after connecting high-resolution external display
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When you connect a 4K external display, you may be unable to click on anything but a small area in the upper-right corner.
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When you connect a high-resolution external display, you may be unable to click on parts of the screen.
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When a qube starts, a fixed amount of RAM is allocated to the graphics buffer called video RAM.
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This buffer needs to be at least as big as the whole desktop, accounting for all displays that are or will be connected to the machine.
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By default, it is as much as needed for the current display and an additional full HD (FHD) display (1920×1080 8 bit/channel RGBA).
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This logic fails when the machine has primary display in FHD resolution and, after starting some qubes, a 4K display is connected.
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This logic fails when the machine has primary display in FHD resolution and, after starting some qubes, a high-resolution display is connected.
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If the buffer is too small, and internal desktop resize fails.
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To determine if this is the problem affecting you, look at the Xorg log inside the Qube at `/home/user/.local/share/xorg/Xorg.0.log` for lines like the following:
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~~~
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[ 1623.988] (EE) DUMMYQBS(0): Unable to set up a virtual screen size of 3440x1440 with 17101 Kb of video memory available. Please increase the video memory size.
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~~~
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The solution to this problem is to increase the minimum size of the video RAM buffer, as explained in [GUI Configuration](/doc/gui-configuration/#video-ram-adjustment-for-high-resolution-displays).
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## Screen blanks / Weird computer glitches like turning partially black or black boxes
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