I picked up a Radeon HD 6770 graphics card to put in my brand-new Gateway DX4860. Specs
Naturally, when I noticed that I couldn't plug any power into the card, I also picked up a new 600W power supply. The power supply is running just fine. I also know that it's supplying power to the card, because the card's fan is running.
The big problem is that the computer doesn't see the card, so I can't install the drivers. In the Device Manager, the card doesn't appear at all, with no hardware components unknown.
I contacted Gateway, and they told me that I need to disable the integrated card, but unfortunately, they "don't recommend it", and wouldn't tell me. Problem is, I don't see any option in the BIOS that would help. I tried updating the BIOS, but it kept telling me that the ROM was the wrong size and wouldn't do it (even though I got it from Gateway's page for this model).
I will also note that this is the first extra graphics card going in to this system, so there aren't any extra drivers on the system to worry about, except for those for the integrated card.
It's also possible that the graphics card is damaged, but I want to be 100% sure of this before I go through the trouble of replacing it. Unfortunately, I don't have another desktop that I can use to test the card.
Any ideas how I can get this graphics card working?
EDIT: I should also say that I'm connecting this to my TV via HDMI... I don't have another monitor and I don't have any other cables to connect it another way.
That Radeon HD 6770 can be made to work in that system. I looked it up on Gateway's Web page and it specifically states that Discrete graphics is supported. You should be able to just plug it in, move the HDMI cable to the new graphics card (you did that, right?) and it will automatically switch to the discrete graphics as the default. If it's not working then it coud be because you didn't move the HDMI cable before you booted it up. However, the new card should appear in control panel under the device manager tab. If it's not open up the computer, reseat the graphics card (make sure it goes all of the way into the PCIe slot), make sure the HDMI cable is plugged in to the Graphics card an NOT the motherboard graphics output, make sure that the 6 pin PCIe power cable is plugged into the graphics card. You should be able to see the BIOS boot screen(s) even before windows loads.
I did try booting it up with the HDMI cable in the video card, and it sent no signal to the TV.
I've also tried reseating the card. It seems to be in there properly. To back this up, I found that the fan only runs when the card is seated in the computer and the power cord is connected, and the card's fan is running fine.
I can get into the BIOS easily enough. I saw some advice somewhere that said to check in the Peripherals category, which I have, but I don't think any of the options in there apply. There's nothing about graphics, video, or even PCIe.
I have one new piece of information to add. I booted into Safe Mode and disabled the Intel driver, then shut it off and restarted with the HDMI cord in the Radeon card. It didn't send the signal to the TV, as before, but later on, when I plugged it back in to the Intel card, it still didn't send a signal. When I restarted it later with the core in the Intel card, it sent a signal again.
What this tells me is that plugging it in to the graphics card probably caused the computer to disable the onboard graphics. So then the question is, is there anything else I can possibly try to get this thing to work?
Just a question as I had the same computer before I just built my own recently and did almost the same thing, I too put a 600 w psu in the gateway Dx 4860 and ran a gtx 560 sc 2gb card and ran HDMI to TV, do you have a monitor hooked up or just the TV and if so did you go to display settings and choose what display you want to use, I had to hook up both then selected detect display option and choose the TV, I too had little bit of trouble at first but the card detected right away with just pc monitor plugged into card.
Just one other thing I loved the computer but be aware the case does not have good airflow so just watch your temps if you overclock, I now have the card in my Nzxt 410 case runs 10-20c cooler and is way overclocked and voltage way up.
Check the documentation on your TV. Some TV's don't support input from a Computer on every HDMI input. Make sure that the input you are using does support input from a computer. Also check the setup menus on the TV. There may be an option to configure the inputs to support a computer.