No input signal and six beeps after putting in new graphics card

[Sloths]

I recently bought a XFX Radeon R7 260x graphics card and due to circumstances, a Dynex 520 watt ATX power supply to accompany it. After putting the power supply into my computer, I am able to boot up and start everything normally with the integrated graphics. However, when attempting to boot up with the new graphics card, my computer produces six short consecutive beeps and my monitor is black with the "no signal input" message. The computer does not shut off by itself, and there is a red light on the motherboard. Please help.

Computer specifications:
HP Pavilion 500-164
Motherboard: MSI MS-7778
Power supply: Dynex 520-watt ATX
Graphics Card: AMD Radeon R7 260x
Processor: AMD A8-6500 with integrated graphics.

 

[smorizio]

you may have to update the mb bios. it may be a bios bug.

 

[das_stig]

Dynex and sister brand Rocketfish are both owned by Futureshop / Best Buy

PSU is a piece of rubbish for high end video card.

The Dynex 520W power supply has two +12v rails; 18A and 16A.

Therorectically, if the two rails are loaded to it's absolute max before they exploded it can supply 408W...but in reality it is a bit less.

Expect 16/17A and 14/15A nominal. That would mean 384W at best.

It also states the Max overal Wattage is only 420W, and the overal Peak Wattage is 520W.

Really, this is no "520W"; it is more of a 400W-430W at best.

 

[Sloths]

Do you think that my power supply could be the source of my troubles?

 

[Sloths]

Alright, I got everything working. After disabling Secure Boot and enabling Legacy support on my UEFI Bios (Windows 8 Bios), I just had to plug in the monitor to the card.