AMD 7870 wont fire up after install

[Domtom1979]

I need help starting my computer up while using the new card I installed. It boots, but black Screen. I have to unplug the power on the new gpu so it will boot up on the integrated graphics. Everytime I try to start with the new GPU plugged in, it boots up but black screen and TV says no connection

 

[Onus]

Please provide your complete system specs, including the brand and model (not just wattage) of the PSU.

 

[Domtom1979]

HP Model# P7 1226s
6gb Ram
Quad core Intel i3 2130 3.4 Ghz
1tb HDD
Thermaltake TR2 500w
AMD 7870 Mystic

 

[reedo_43]

Your power supply is probably lacking. Does it even have the right connectors?

 

[Domtom1979]

Yes, It does have all the required connectors. I was told I needed 450w minimum for the card. But that is un confirmed

 

[reedo_43]

Never mind. If you are using the stock 300Watt psu...that is your issue. Don't even try to get it to work unless you upgrade or your just looking for trouble.

 

[Domtom1979]

I am new to Toms Hardware. I dont see the entire post, I only see the thread information. Did you see my entire description of whats going on?

 

[Domtom1979]

I am using an upgraded 500w Thermaltake TR2 500w

 

[reedo_43]

That should be enough. Have you got the drivers installed? What does it look like in device manager when booted up with intel graphics?

 

[Domtom1979]

Drivers are installed, It shows up in Device manager and is working properly, No errors

 

[Domtom1979]

could the stock soundblaster card be causing an issue? I can always un install that

 

[Domtom1979]

Not sure if this info helps, But before I installed win 8.1pro I kept getting code 12 errors and never could get it working properly accordingly to Device Manager. After installing win 8.1pro and uninstalling the drivers and reinstalling them it at least showed up correctly in Device Manager

 

[reedo_43]

In the bios, is there a choice to start which card first or just disabling the onboard?

 

[Domtom1979]

Bios was VERY lacking in my opinion. I dont remember seeing either of those options. I saw a disable PCI e and a enable pcie snooper. whatever that means. I will look at bios again right now to confirm

 

[reedo_43]

Well you don't want to do that. Maybe the card is just bad. Another pc to test it in?