Radeon 5770 HDMI output doesn't work

My machine is fitted with a Radeon 5770 video card. I normally connect to my monitor via the dvi output with no problems. However when I noticed that both the monitor and the video card have HDMI ports I tried connecting with a HDMI cable. The result was a "No Signal" error on the monitor and no video as a result.

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XFX Radeon 5770 - Blurry
I recently built a new computer and am having an incredibly difficult time getting the graphics card (XFX Radeon 5770) to function properly with Windows 7, 64-bit (via HDMI).
Everything looks a bit blurry, especially the text. HDMI, DVI, and VGA connections all look bad. VGA looks a little better, but not as clear as HDMI wiith my Windows XP machine, and I also want to output sound.
A few notes:
* Running the the most recent ATI drivers (10.6)
* Pixel ratio set to 1:1 on the TV
* Using native resolution (1080p/60hz, also tried 59hz without improvement)
* Overscan set to 0%
* ClearType text has been adjusted
* Tried older drivers: 10.5, 10.4, 9.8, and 9.1 without success
My 5 year old Windows XP Dell, with a $40 Radeon 4350 card, has no problem producing crisp text via HDMI on this same HDTV. I tried the same 4350 card in my new Windows 7 computer and experienced the same problem as with the 5770.

size of the video card
The onboard Radeon 4200 doesnt have the juice i need to play games. So i'm looking into getting the Radeon HD 5770. The only problem is i'm not sure if it will fit on my motherboard due to the Onboard video heatsink being right at the end of the PCI express slot.
Do yall think it will fit?
Newegg.com - GIGABYTE GA-MA785GMT-UD2H AM3 AMD 785G HDMI Micro ATX AMD Motherboard
Video card
Newegg.com - XFX HD-577A-ZNFC Radeon HD 5770 (Juniper XT) 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card

Problem with Graphic Cards and Philips TVs
I have connected my computer to the Philips Aurea 42PFL9900D through HDMI.
Everything seems to work fine except 1 thing and that is that the screen blinks (black screen) for 1 second and then goes back to normal sometimes.
I thought that it might be a problem with the graphics card (gtx 260) but yesterday I bought a new graphics card, just for this bloody issue (HD Radeon 5770) and I still have the same issue.
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Need your opinion on video card upgrades
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(XFX Radeon HD 5770 850MHZ 1GB 4.8GHZ GDDR5 2XDVI HDMI Display Port DIRECTX11 PCI-E Video CARD, HD577AZNFC In Canada.)
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When I turned it back on I heard a "peep peep peep" sound from the computer after a few seconds and there was no screen on the display. I could hear the harddrive working etc but no graphics.
I then switched places on the HD 5770 card (There were 2 blue contacts that looked the same) and the computer turned on. This time it worked for aprox 20 minutes (with new drivers installed) until the computer suddenly froze again. When I tried turning it back on, I got the beeping sound again and nothing showed up.
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I have been looking at the GTX260 for a while now. I just went to buy one and these 5770 cards offer quite a bit more (HDMI, display port, DX-11 to name a few) for the same or less money. You video card experts tell me if I'm looking at this right. I don't know much about this matter.
Am I better off going with a 5770? I hear the drivers are not up to Nvidia's standards. I have LOVED Nvidia drivers over the years. Am I going to regret buying this card. (thinking about a Sapphire 5770, but it looks like they are all 1GB GDDR5 cards)

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I have recently bought a radeon hd 5770 1gb card and when I'm playing music it stops playing for about 1 second and in game the computer locks up and a text box comes up on the desktop saying the graphics have been reset and I'm wondering if this can be caused by my power supply, that's what iv read on other forums but I want to know what the problem could be.

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Whats the better cards out of these? There is my price range.
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now i hear that the 5 series ATI cards have issues at the momment, with driver crashes and the CCC randomly acting up, i never has an graphics card before (my first built pc im doing, allways been in the MB). So i dont know if to risk getting the 5770 because of the problems at the momment.
But to be honest i would rather get the 5770 because im building a sysstem with an AMD 965 so ATI card will go well, and it has DX11.

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I'm having problems with my Radeon HD 5770 graphics card while running windows 7. It is brand new, as is my hard drive, motherboard, psu, ram, and i5 processor so i put all this together in my PC and installed windows 7 however i've come into some trouble in that the graphics card stops working and often (not all the time) I get the message "Display Driver has stopped responding and has recovered. Display driver ATI Radeon Family stopped responding and has successfully recovered'

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The exact same DVD played perfectly well yesterday.

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5770 Driver Help
I just purchased an MSI Radeon HD 5770 graphics card and am having a little problem. I can play games using the card and have also installed the ATI software and driver manually (Catalist Control Center). The problem I am having is that Windows is not using its special effects even when they are selected in the options, the appearance seems to stay blue, I could change the colour befor using the control panel but do not have this option since I have installed this card, the animations do not also work and I really dislike this.