NUC8i7HVK显示灰色屏幕，直到Windows欢迎屏幕

大家好，
我最近得到了一台NUC8i7HVK并打算用它作为HTPC从我的NAS播放4K HDR remux。
增加了2支Crucial 8GB DDR4 2400MHz内存和三星970 Evo 256GB M.2 SSD。
操作系统是Windows 10 1803.AMD驱动程序是18.9.3
NUC通过我的AV接收机Onkyo TX-RZ800使用HDMI连接到我的电视LG OLED 55B7到HDMI 2.0a端口。
启动后，我的电视上出现灰色屏幕，直到Windows 10欢迎屏幕出现。
如果我尝试进入BIOS，我仍然会看到灰色屏幕。
因此，为了配置NUC，我必须将它连接到使用HDMI到VGA适配器的旧13“AOC监视器。在此之前我使用的是第3代i5 NUC，它没有任何此类问题。
我已经将BIOS升级到最新版本，但在HDMI输出和多条HDMI线缆上仍然存在相同的问题。
相同的AV接收器具有以下连接，并且没有一个具有此问题：
1.我的游戏PC包括SLI中的2xGTX980ti和i7 5930k。
操作系统与NUC相同。
我可以进入BIOS并进行更改。
2. XBox One X.
3. PS4 Pro
4.卫星电视盒。
每次我需要更改设置时，将新NUC连接到旧AOC显示器是不可行的。
我也不想绕过AV接收器，因为这会破坏使用NUC作为HTPC的目的。
请帮我解决这个问题。



以下为原文

Hi All,

I recently got myself a NUC8i7HVK and intend to use it as HTPC to play 4K HDR remuxes from my NAS.
Added 2 sticks of Crucial 8GB DDR4 2400MHz ram and Samsung 970 Evo 256GB M.2 SSD. OS is Windows 10 1803. AMD drivers is 18.9.3
The NUC is connected using HDMI to my TV LG OLED 55B7 via my AV receiver Onkyo TX-RZ800 to a HDMI 2.0a port. Post boot up, I get a grey screen on my TV till the point the Windows 10 welcome screen comes. If I try and go into the BIOS I still get a grey screen. Hence to configure the NUC I had to connect it to an old 13" AOC monitor using HDMI to VGA adapter. Prior to this I was using a 3rd Gen i5 NUC which didnt have any such issue.
I have already upgraded the BIOS to the latest available and still have the same issue on both the HDMI outs and with multiple HDMI cables.
The same AV receiver has the following connected and none of them have this issue:
1. My gaming PC comprising 2xGTX980Ti in SLI and i7 5930k. OS is same as NUC. I can go into the BIOS and make changes.
2. XBox One X
3. PS4 Pro
4. Satellite TV box.

Connecting the new NUC to the old AOC display everytime I need to change a setting is not feasible. Neither do I want to bypass the AV Receiver as that would defeat the purpose of using the NUC as HTPC.
Please help me in resolving the issue.