GPU problem.. stuck on 640x480 resolution..

Can you test the card in some other PC? It could also just be broken.

Edit: also have you connected all extra power cable to the GPU? I think I once had a similar problem, usually they don't boot without them but some might only enable VGA resolutions.

Isn't that simple to check where the cable goes. And what generation of onboard GPUs only give VGA resolutions while supporting using a new card like that?

Hold F2 or whatever button is for the BIOS for your motherboard before powering on your PC. This should do the trick

You mean, you aren't even able to access the BIOS with this card attached and you have to switch the cards in order to access it?
Oh well, your card is most likely broken then.

It doesn't make any sense. If it doesn't go past BIOS it can't load Windows. Make sure you repeatedly press your BIOS key (F2, F10, Delete) until the BIOS settings show up.

Is it skipping the BIOS because of fast boot or is the monitor not coming on fast enough to see the Power On Self Test (POST) screen? If it's because of fast boot, you can get in the BIOS using the advanced startup option in Windows. If you have Windows 10, search for "advanced startup" in the windows settings and it should find it, if not it's oddly enough on the Update & Security > Recovery page. Click the Restart now button and it will reboot into the BIOS. Another way is to remove the power for about a minute and this usually makes the PC display the POST screen. If none of those work, you'll need to get your MB's manual and find out how to reset the BIOS, it's a jumper or switch on the MB itself. After doing a manual reset, the PC should stop after the POST asking you to press a key to load default settings and continue or another key to enter the settings.

If the monitor is not coming on fast enough to see the POST screen, just spam the button after pressing the power. You can also try holding it down as Argamore says, because sometimes it will stop on the POST screen thinking you have a stuck key. As for what key, you'll need to press, you'll have to look in the manual as it varies between manufacturers. DEL is the most commonly used key, but I've seen systems that use F1, F2, F10, F11, F12. and some odd ones that used HOME and INS.

I had a similar problem with an AMD card a while back and it turned out to be the monitor. If you're using a DVI cable, try using a VGA cable instead. This will narrow down the problem. If your card doesn't have a VGA port, you will need a DVI to VGA adapter. Cards used to come with them, but newer ones probably don't. There is a chip in the monitor contains the Extended Display Identification Data (EDID). It basically tells the video card what it can handle, and somehow the EDID in my monitor became corrupted. My old NVIDIA card was working, but when I bought the new AMD card, the monitor never came on until it was at the Windows desktop and like you, I was in 640x480. AMD cards are real picky about that EDID, if they can't read it, it only runs it in a safe resolution of 640x480 @ 60Hz. I used the DVI to VGA adapter and VGA cable and it worked. I was able to borrow a friends monitor and the new AMD card worked on it over DVI. In the end, I put my old NVIDIA GPU back in, sent the AMD card back and bought a new NVIDIA card. At that time the NVIDIA card was more expensive and not as fast, but in order to use the AMD card I would have had to buy a new monitor too.

Sorry, stupid question: did you put the HDMI/DVI/Displayport cable into the GPU and not into the motherboard?

Yes i try all outputs... in the device manager just show the name of the video card, but the values are strange too... there is no sound after disconnected or when i disable/uninstall the drivers... monitor turn on too slow also

Ah, the problems occured right after you changed your motherboard?
Well maybe you encountered some odd incompatibility between your card and MB. Asus MBs can sometimes be a little bitchy with certain components.

You should test your card in another PC or MB, I think that's the easiest way to find out if the card is faulty or not.

I could find that the m5a97 + R9 290 is something that worked for people, so it's not a problem with complete incompatibility, but it does seem that the m5a97 tends to have problems with graphics cards.

It's also possible that something happened to the graphics card. When I had problems with my HTPC I took out my RX 460 (with some effort) and when I put it back in it didn't work.

Edit: Also, have you installed the chipset drivers? Probably won't matter, because you already have a problem in BIOS, but just another thing to check.

It might be a problem with your PSU, you should check it as well. ;)

It's interesting that the old motherboard doesn't work and it worked before.

Perhaps something happened to the 6 pin / 8 pin power cables. If the card is getting less power than expected it might be a problem.

(Long shot, but at this point I think we checked all the immediate suspects.)