No monitor signal--please help quickly!

3.0/2.0 doesn't matter.

how old is the monitor and what type is it?

what kind of cable are you using?

Here are few thing you need to check:
1. Did you check the power consumption requirements for the card before buying it? as far as I can see It draws out 150 w n needs an additional 6 pin power connector direct from your PSU.
2. Does your PSU have that 6 pin connector at all? AFAIK most low end PSUs lack the extra 6 pin connector required for high end GPUs.
3. Do you have UEFI bios? because it's clearly stated in the description of the card's official specs that it does not support UEFI bios. n You can only get it working on UEFI with a bios update if you've an Asus board.

Which you don't have to worry about: PCIe 3.0 cards are backward compatible with PCIe 2.0 slots.

now your solution as I checked all products online.

THE PSU DOES NOT HAVE EXTRA 6 PIN POWER CABLE THUS IT CAN'T POWER UP THE GPU. SO YOU BETTER RETURN THE PSU AND GET A 600W PSU WHICH HAVE AN EXTRA 6PIN CONNECTOR! I personally have a cooler master eXtreme power plus 600w! it works like a charm n has the extra 6pin connector.

here are few links for your concern:

GPU spec link: http://www.asus.com/Graphics_Cards/HD77702GD5/specifications/
PSU link: http://www.corsair.com/en/builder-series-cx430-v2-80plus-certified-power-supply

"The number of connectors in general is very restricted, something partially justified by the small capacity of the PSU. Regarding the peripheral connectors we would like to see two additional ones, since three are very few. Also to our surprise the PSU is equipped with a single 6+2 pin PCIe connector. To the best of our knowledge there isn't any VGA card that uses a single 8-pin power connector, instead all midrange cards are powered by one or two 6 pin connectors. High-end cards come with 6+8 pin or 2x 8-pin - but never a single 8-pin alone. It would have made much more sense if Corsair had put two 6-pin connectors on the cable, which have a maximum power draw of 150 W, just like a single 6+2 connector." from a review of the PSU from 'techpowerup'. Basically you need a stronger PSU.


UPDATE: I just checked that the mobo has UEFI bios. So even if you get a better PSU there might be compatibility problems with the mobo. So I think you should change both your motherboard n PSU to accommodate that card. Or you can simply change the card to support both your PSU n mobo. You can try the less hassle free GPU replace. or if the GPU is dear to you then you know what to do! If you change the card then AMD R7 250X will be a good choice considering your PSU n mobo.

Hello,

When starting the PC, did you hear a series of beeps?

all power is connected to the motherboard... 4/8pin up by processor and 20/24pin on side of board?.............

if the card has a 6pin pci-e power inlet you have power from the power supply to that?

did you try putting the ram in a different slot?

you say you have other computers. do those computers have graphics cards? and can you maybe try one of those that you know works in your new machine?

can you try your 7770 in one of those?

The cheapest way to fix the problem is to exchange your GPU. Get an AMD R7 250X which is a rebranded 7770. n Also what is your monitor's display resolution?

UPDATE: I just checked that 250x supports UEFI n It's gonna run on the same PSU you have! I personally don't think you need a 2 GB card unless you have a really large monitor with big resolution.

breadboard it and see what happens before you go out and spend more money.

also, got a gamer buddy who's machine you can stick the card in to test it?....... provided he has the power to run it..??