Monitor won't turn on with HDMI but works with VGA....

I was on my computer this morning checking my email and such, I was on for about 10min and then turned off my computer. Came back a little later tried to turn on my computer it powered on and made the normal noise and such and the screen stayed blank with the yellow indicator light on. I unplugged the hdmi cord and cleaned it and plugged it back in nothing, removed my graphics card and cleaned it and nothing. Found a DVI cord and a DVI to VGA adapter plugged it in, works fine anyone know the reason why it might do this?

OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer System manufacturer
System Model System Product Name
System Type x64-based PC
Processor Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz, 3301 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 0401, 7/15/2011
SMBIOS Version 2.6
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 7.98 GB
Available Physical Memory 6.52 GB
Total Virtual Memory 16.0 GB
Available Virtual Memory 14.2 GB
Page File Space 7.98 GB

Name AMD Radeon HD 6900 Series
Adapter Type AMD Radeon Graphics Processor (0x6719), Advanced Micro Devices, Inc. compatible
Adapter Description AMD Radeon HD 6900 Series
Resolution 1920 x 1080 x 60 hertz
Driver (, 359.00 KB (367,616 bytes), 6/11/2012 9:26 AM)
4 answers Last reply
More about monitor turn hdmi works
  1. faulty hdmi cables or the actual hdmi port on the gpu is faulty.
  2. guess i should findanother hdmi cable and test it. is there a program u can run to test ur ports and c if they all fuctioning?
  3. well, there should be a built in option with your gpu driver. User display detect feature on your ati catalyst. So when the pc is on, disconnect the vga and connect the hdmi and see if it powers up. Tho my best guess is, the hdmi port is faulty on that gpu. Happened to me numerous times.
  4. man i have had nothing but problems with this gpu it seems. if that is the case this would be my 5th gpu thankfully my computer is still under full warrenty
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