SOLVED : Facepalm Solution, tried a third HDMI cable, the one from my other PC, it worked, see Post 6. Thanks.
Hello, hope someone knows a solution for this, spent hours looking for answer on internet but nothing works.
I have an LG23mp68vq-p monitor must be 2 years old now, monitor is detected with correct type and name in display settings on another computer, with all resolutions etc available to select. However on my current PC it is not detected, AMD control panel does not detect a device attached to graphics card. just shows 'Display divice on:HDMI' with 2 monitor profiles. although can still display an HD image.. nothing wrong with graphics card either, plug HDMI cable into back of my LG TV and detects works perfectly. See Images at bottom: can not delete monitor2, can not run detect etc.
Played lifeless planet on full HD settings, watched a few things on YouTube, turned off PC went to bed. Next day, blank screen, PC did not boot, although it could have done, but nothing showing on screen. Decided to do Restart. PC did its own little shut down and restart for some reason, still no image, switched to LG, saw message about failed boot drive, restarted, into BIOS, restarted from there. Switch back to my Monitor, this is when problems started, Lifeless planet only showed 640x480 res. Took another day until realised this was not game issue but system.
OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
System Type x64-based PC
Processor AMD FX-8350 Eight-Core Processor, 4000 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 2603, 26/06/2015
SMBIOS Version 2.7
Hardware Abstraction Layer Version = "6.1.7601.17514"
Installed Physical Memory (RAM) 16.0 GB
Total Virtual Memory 31.8 GB
Page File Space 15.9 GB
Name Radeon RX 470 Graphics
PNP Device ID PCI\VEN_1002&DEV_67DF&SUBSYS_E349174B&REV_CF\4&14E8F4CB&0&0010
Adapter Type AMD Radeon Graphics Processor (0x67DF), Advanced Micro Devices, Inc. compatible
Adapter Description Radeon RX 470 Graphics
Adapter RAM (1,048,576) bytes
Installed Drivers aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver Version 24.20.11001.5003
INF File oem29.inf (ati2mtag_Polaris10 section)
Color Table Entries 4294967296
Resolution 1920 x 1080 x 60 hertz
Driver c:\windows\system32\drivers\atikmpag.sys (24.20.11001.5003, 531.38 KB (544,136 bytes), 25/04/2018 05:24)
Memory Address 0xC0000000-0xFFFFFFFF
Memory Address 0xD0000000-0xD01FFFFF
I/O Port 0x0000E000-0x0000E0FF
Memory Address 0xFEA00000-0xFEA3FFFF
IRQ Channel IRQ 4294967294
Display No Problems, however this is a strange entry. Monitor : x.
Any ideas to solve this, apart from reinstalling WIn7!
Edited by BumblingBear, 21 July 2018 - 08:34 AM.