Screen goes black after a while after installing new graphics card


TS Rookie
Hey I'm not sure where to start but a while ago I bought a desktop and a monitor and they are

Desk Top: - Acer Aspire AX1420-UR10P (PT.SG9P2.003) Desktop PC Athlon II X4 645(3.1GHz) 4GB DDR3 500GB HDD Capacity NVIDIA GeForce 6150 SE Windows 7 Home Premium 64-Bit


But the graphics card that came with the computer sucked, it simply doesn't support 3D games.

So I went ahead and bought this graphics card:

[FONT=inherit][FONT=inherit][FONT=inherit]Graphics [/FONT][FONT=inherit]Card[/FONT][/FONT][/FONT]: - GIGABYTE GV-N520SL-1GI GeForce GT 520 (Fermi) 1GB 64-bit DDR3 PCI Express 2.0 x16 HDCP Ready Low Profile Ready Video Card

Here note that the maximum power my computer has is 220W but the graphics card needs at least 300W for it to run

So I bought this power supply unit:

[FONT=inherit][FONT=inherit][FONT=inherit]Power [/FONT][FONT=inherit]Supply[/FONT][/FONT][/FONT]: - Antec VP-450 450W ATX 12V v2.3 Power Supply

Here's the story:

After I bought my computer and the monitor I bought the graphics card. It took me a while to figure out how to install it, but I worked my way out and installed it. So I followed the general guide to installing graphics card, remove driver first, install card, (the computer didn't have a card so the [FONT=inherit][FONT=inherit][FONT=inherit]pci[/FONT][/FONT][/FONT] slots were empty) then I started my computer and tried to install the new driver with the disc that came with the graphics card. The first time it went so well that I thought it's gonna work, but after a while the screen suddenly goes back and on the top right corner it says "VGA then [FONT=inherit][FONT=inherit][FONT=inherit]DVI[/FONT][/FONT][/FONT]..."
It's the screen you get when the monitor isn't plugged into a desktop.

So after that I went to look at my computer and the card and I found out the card needs more power, it needs 300W but the computer has 220W.

So I bought a 450W power supply unit, also took me a while because my case is [FONT=inherit][FONT=inherit][FONT=inherit]micro [/FONT][FONT=inherit]ATX[/FONT][/FONT][/FONT] board. I have to leave the power supply unit outside the case.

So after I installed the power supply and the graphics card, the first time trying to install the driver also went pretty smooth but the screen then went black after a while. So I'm wondering what exactly I should do, I'm pretty sure the power supply is working. Atm I'm using the power supply but not the card and I can run my computer fine.

Addition details :
When I tried to uninstall the original graphics card driver, it kept automatically installing itself when I restart. Could that be why? But after I uninstalled it I switched to the VGA port on the new graphics card, but it still didn't work.

I have my directx updated to version 11.

Please if you're confused about anything I said tell me which part you didn't understand and I'll try my best to describe it!

Thank you for your time.

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