46SL412U Sudden No Video Signal for all HDMI Ports

My daughters and I were playing the Wii U tonight on our Toshiba 46SL412U LED TV when suddenly the picture when black and the No Video Signal message came up. I changed out the HDMI cable thinking the cable went bad, but still no picture. I power cycled the TV, still nothing. I am also not getting any picture with any of my other devices that are hooked up via HDMI port (BluRay player, Chromecast). Oddly, the REGZA-LINK still recognized that the BluRay and Chromecast are plugged in and switches to the correct input when I power either of them on, but i'm still getting the No Video Signal message.
Is there a setting I've missed that suddenly changed, or did all of my HDMI inputs suddenly go bad? What can I do to fix this issue?

To check the Graphics card's funtionality you may go to BIOS menu and see if is it listed or not; if yes, then it's working, and you may have to check the video/HDMI cables.
Try to boot the PC without connecting any device other than monitor, power cable, mouse and keyboard.
To check the warranty, you may use the below link:
http://www11.itrc.hp.com/service/ewarranty/warrantyInput.do?admit=109447626+1275645640303+28353475
If you have any doubt regarding the warranty, contact HP support.

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Hello, welcome to forum.
"When i turned the computer on for the first time, the system boots up and there is one small beep, sounds like it is posting, but I get no video signal from my monitor, which I checked on my other computer and is working fine, I tried both video cards in the 1st slot, in non-sli mode and I get the same result each time, so I get no video signal with all ways tried?"
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power down PC, remove power cord from the PSU and Clear CMOS Guide
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"Do I not have enough power in this PSU to run what I have? The video manufacturer suggests a 450W PSU, which I meet, but do I not have enough juice the 12V rails? And would this cause the no signal?"
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https://forum-en.msi.com/index.php?topic=105635.msg783148#msg783148
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Quote from: Svet on 16-November-12, 06:48:32
then you should contact mainboard vendor about it as problem is not in the VGA.
I had given what I thought was sufficient information about the PC spec in my first post. Both what I started with and what I'd changed. But I'll give the full spec here:
Motherboard: GA-X58A-UD3R Rev 2.0
CPU: Intel I-7 950 3.06 GHz
Memory: 3x4GB Crucial DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.5V • 512Meg x 64
Disks: Samsung 64GB SSD SATA System disk
WD 1TB and 500GB SATA drives
PSU: Coolermaster RS-850-SPHA-D3 80+ Gold - 3.3V:22A, 5V:25A, 12V:70A single 12V rail
GPU: MSI GTX 670 2GB OC Power Edition
OS: Windows 7 Professional 64-bit
The changes were the PSU and the GPU. The problem started when I had an XFX Black Edition 80+ Bronze PSU and a Gigabyte GTX 580 GPU otherwise the rest of the spec was and has remained the same. With my original spec, it ran perfectly happily for almost 2 years but then started with the system rebooting without warning about a minute after login (it would stay at the login screen indefinitely). After running some tests the clues seemed to point to the GPU configuration having been corrupted in some way (from sfc logs). However, if I set Windows to Selective startup, I could login and the system would stay up. I decided to do a system repair from my Windows 7 installation disk but had to postpone this for a couple of weeks during which time the PC was powered off.
When I next powered up the system, there was no video signal at any time. The investigation I did made me think either the GPU was faulty or there was a PSU problem - all other aspects of the system could be shown to work. I returned the GTX580 as it was under warranty and purchased the GTX670 with the refund. This exhibited the same symptoms as the 580 - no video signal no matter how long I left the system running. I was able to test the 670 in another system and it worked there. I couldn't run this test with the 680 as the PSU did not have an 8-pin PCI-E connector - just 2 6-pin connectors.
I then added an NVidia Quadro card alongside the 670 and booted the system with this as the display GPU. This gave me a video signal at all times and more importantly allowed me to get into Windows and check if it recognised the 670 in Device manager. It did but reported a problem as, until now, I hadn't been able to load the 670 driver. I did this and rebooted - again no video signal during post and initial Windows boot but I did get video as soon as the newly installed driver was loaded. This is the state I'm in now other than I've flashed the vbios as suggested and the GPU no longer works on my other PC.
Note, I can happily remove the Quadro and boot the system with just the 670, except I don't get any video signal until Windows has loaded the 670 driver - the monitor light stays stubbornly orange till that point. After that, everything seems to be fine - I don't get the reboots that this problem started with. The only other clue I have is with my original spec I always had a problem from shortly after building it where I would need to power cycle the system most times as I could not wake it from hibernate mode.
I'm hoping this helps as I know I have run out of ideas of things to do. The only thing I have left to try is update the motherboard BIOS.
George

46SL412U Sudden No Video Signal for all HDMI Ports

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