Question I want to run a second Monitor (Koolertron) to work with my existing HP Computer with 40" iiyama Monitor setup.

May 20, 2019
Hi there, people knowledgeable about Monitors.

When you reply, please, please treat me as someone with a mental age of 12 (always fun!), because I am NOT technical at all and will need any solution spelt out slowly and clearly.

I have a HP computer, HP 550-254na, Windows 10 Home 64-bit, Version 1803, Os Build 10.0.17134.
Intel Core 15-6400 CPU @2.7 ghz, 8.0 GB RAM, Intel HD Graphics 530. Resolution 3840 x 2160. Driver Version

I have an excellent 40” iiyama Prolite X4071UHSU-B1 with 4k resolution. VGA x1 (max. 2048 x 1152 @60Hz) HDMI x2 (HDMI1: max. 3840 x 2160 @60Hz, HDMI2: max. 3840 x 2160 @30Hz, 2560 x 1440 @60Hz, 1920 x 2160 @60Hz, HDMI3: max. 3840 x 2160 @30Hz, 2560 x 1440 @60Hz, 1920 x 2160 @60Hz).
The Monitor’s connectors therefore are: a VGA D-Sub mini 15pin Connector, a DisplayPort Connector, HDMI -1(4k 60p)HDMI-2/MHL and HDMI-3.

So, on to the problem. I have now bought a 15” Koolertron Monitor (from China) to act as a second Monitor 20 feet away in a little vocal booth I have constructed (for voiceover work). I bought the Koolertron because it’s thin, light, has a small stand (I only have a small shelf in the booth), and has internal speakers. Its specs are 15.6 inch, 1080P HDR Gaming Monitor, 1920* 1080 HDMI Portable Monitor with speakers for NS PS4 PS3 Xbox PC Mac Raspberry pi FPV Computer CCT. It’s had good reviews, assuming they are genuine.
So I have run a HDMI cable from the computer’s HDMI socket to the Mini-HDMI socket in the Koolertron (so the cable has HDMI at one end, and Mini-HDMI at the other end).
The problem is that when I turn on the Koolertron, it refuses to show anything on its screen except ‘No Signal’ followed by ‘Power Saving’ and turns off.
The wider problem is that, instead of mirroring what’s on the Iiyama screen (which is what I want), putting in the mini-HDMI cable into the Koolertron instead somehow rearranges the icons on the Iiyama screen and then for some reason it’s not possible to go into Display settings to try and have the HP computer detect both screens! I repeat that I can only go to display settings with the HP computer and the Iiyama BEFORE I plug in the Koolertron. And obviously in that situation it only shows the Iiyama. Once I connect the Koolertron I can’t access display settings etc.

This is really becoming a bore after a couple of weeks of trying to figure it out, and I am faced with returning the Koolertron Monitor to China unless some bright spark here can help me sort this out.

Can anyone either explain how to make this set-up work, so that I can successfully mirror the content on the Iiyama screen, or suggest an alternative monitor which is GOOD, around 15”, is thin, has a small stand, has speakers, (like the Koolertron), and won’t break the bank (Koolerton was less than £200).