Power supply help! expert guidance needed

[wooyeol]

Hello! I just built a computer from scratch recently and I've had problems where the monitor would remain black if I plug in the pci-e cable from the power supply to the graphics card. if i don't plug the cable the monitor stays on and everything is fine but when i plug in the pci-e cable the computer runs as usual but the monitor stays black and doesn't detect anything. What seems to be the problem? maybe the power supply? please help~

CPU: Intel Core i5 3570K 3.4GHz LGA 1155 Processor
Motherboard: ASUS P8Z77-V LX Socket 1155 Z77 ATX Intel Motherboard
RAM: Crucial Ballistix sport 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 Desktop Memory Model BL2KIT51264BA160A
Harddrive: Crucial 128 GB m4 2.5-Inch Solid State Drive SATA 6Gb/s CT128M4SSD2
Video Card: XFX FX777AZDB4 Double D HD 7770 Black Edition 1095MHz 1GB DDR5 miniDP HDMI DVI PCI-E Graphics Cards
Power Supply: Thermaltake TR2 Series 600 Watt ATX Power Supply
CD Drive: Samsung 22X DVD±RW Burner with Dual Layer Support
Monitor: HP w1858(old)

 

[ko888]

Where is your monitor cable plugged into? The video port on the motherboard's back I/O panel or to a video port on the graphics card?

 

[popatim]

hehehe. Yes make sure you are plugged into the 7770

 

[Engima]

Check for graphics drivers.

 

[wooyeol]

wow i was so dumb that i even found out myself after 1 hour hahaha thank you all

 

[wooyeol]

Best answer selected by wooyeol.