Any cable in a computer system that is bent on a sharp angle can cause a poor connection because of the side strain it puts on the socket.
Take a look at all your cables to make sure things are okay.
My Computer
At a glance
Windows 10 Pro. 64/ version 1709 Windows 7 Pr...Intel i7-6800K @ 4.3Corsair Platinum 16 gig @2400EVGA GTX 1070 OC
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home made Desktop
OS
Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64
CPU
Intel i7-6800K @ 4.3
Motherboard
ASUS X-99 Deluxe II
Memory
Corsair Platinum 16 gig @2400
Graphics Card(s)
EVGA GTX 1070 OC
Monitor(s) Displays
Asus 27" LED LCD/VE278Q
Screen Resolution
1920-1080 or 1280-720 HDMI
Hard Drives
INTEL SSD 730-240 Gb Sata 3.0/
PSU
EVGA Platium 1200W
Case
Phanteks Luxe Tempered Glass 8 fans/ one radiator
Cooling
XSPC/ Water Cooled CPU
Keyboard
Das 4 Professional
Mouse
Logitech M705/MX Anywhere 2-S
Internet Speed
100 mbits
Antivirus
Microsoft Security Essentials/ Malwarebytes Premium 3.0/ SAS
Browser
I.E. 11 default/Firefox/ ISP Time Warner Cable/Spectrum
Other Info
LG BluRay Burner/
Sound system-KLipsch-THX/
Icy Dock ssd Hot Swap bays.
Because the card was only $8 and I like ATSC tuner cards. I have two win 7 HTPC setup in the house.
Extra cards let me record more shows simultaneously.
For some reason, the m791 avermedia refused to work in the AMD phenom quad core PC.
Looking at the m791 card, the ATSC receiver section does not have any metal shielding like it does on the m780 card. (But they have an area of rectangular solder like they could have put on a shield)
Wonder if the AMD Phenom board pumps out an EMF that messes up the card's receiver?
Well I will never know. YOu buy a PCIE card to put into a PCIE slot and you expect things to just work.
But typically stuff happens. Like the damaged HDMI cable.