Not sure if my graphics card is compatible.

I am trying to upgrade my gpu. When I install the new one I'm getting 6 long beeps, no signal to monitor. It hhas a 6 and 6+2 pin plugs. I plugged the ones that came stock with my pc. If I start with it installed but not plugged in, no beeps but no signal. I've searched for a few hours on specs and help with install, no luck. Could the plugs I'm using not work for this unit? Or is it not compatible? what am I missing here?

Mobo:
Manufacturer: Pegatron

Form factor: uATX - 24.4 cm (9.6 inches) x 24.4 cm (9.6 inches)

Chipset: Intel Z75

Memory sockets: 4 x DDR3

Front side bus speeds: 5 GT/s (FM Direct Media Interface bus)

Processor socket: LGA 1155

Expansion Slots:

1 PCI Express x16 (Gen 3.0 for i5 and i7 Ivy Bridge processors, all others Gen 2.0)

3 PCI Express x1 (Gen 2.0)

1 PCI Express mini card


Gigabyte Radeon r9 290x:
Chipset

Radeon R9 290X

Memory Clock

5000 MHz

Process Technology

28 nm

Memory Size

4096 MB

Memory Bus

512 bit

Core Clock

1000 MHz

Card Bus

PCI-E 3.0

Memory Type

GDDR5

DirectX

11.2

OpenGL

4.3

PCB Form

ATX

Digital max resolution

4096 X 2160(via a single HDMI connector or DisplayPort and not supported with two DVI connectors)

I thought I had done enough research, not sure how to proceed.