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Radeon 7970, win 8.1 pro: PC doesn't boot with TV (turned off) in 2nd hdmi

Last response: in Graphics & Displays
May 14, 2014 7:39:11 AM

Hi all,
As soon as I plugged in my TV into my Radeon 7900s second hdmi port, my computer simply refuses to post. My monitor is 'on' but there's just nothing being displayed and it never seems to actually boot. Once I unplug the 2nd hdmi cable and reset, then it boots.

I've googled this and come up with nothing, so I appreciate any insight.
a b * Windows 8
May 14, 2014 7:49:54 AM

Please provide your full system specs, including the brand and model (not just wattage) of your PSU.
May 14, 2014 8:18:26 AM

OS Name Microsoft Windows 8.1 Pro
Version 6.3.9600 Build 9600

System Type x64-based PC
Processor Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz, 3701 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. F16, 10/24/2012
SMBIOS Version 2.7
Embedded Controller Version 255.255
BaseBoard Manufacturer Gigabyte Technology Co., Ltd.
BaseBoard Model Z77X-D3H

PCR7 Configuration Binding Not Possible
Hardware Abstraction Layer Version = "6.3.9600.17031"
Installed Physical Memory (RAM) 12.0 GB
Total Physical Memory 12.0 GB
Available Physical Memory 8.10 GB
Total Virtual Memory 21.9 GB
Available Virtual Memory 16.6 GB
Page File Space 9.91 GB

PSU: Corsair VX550W 550W ATX 12V 41A 24PIN ATX Power Supply Active PFC 120MM Fan
May 14, 2014 8:20:37 AM

and the video card:
Name AMD Radeon HD 7900 Series
PNP Device ID PCI\VEN_1002&DEV_6798&SUBSYS_254D1458&REV_00\4&B77C4C1&0&0008
Adapter Type AMD Radeon Graphics Processor (0x6798), Advanced Micro Devices, Inc. compatible
Adapter Description AMD Radeon HD 7900 Series
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

a b * Windows 8
May 15, 2014 7:43:09 AM

That almost sounds like a grounding or shorting problem. Have you tried a different HDMI cable that you know is good?