Issues with pc after installing new graphics card

Hello techspot! I recently installed a new asus radeon R7 240 with 2GD3 and I started having issues with my pc , like blue screens , slowly working , and freezes , which forced me to reboot and get corrupted files.
I did a clean install of windows , still the same. I really don't know what to do anymore and before I want to go to a specialist I want to know what's wrong.
My specs: Intel GMA 3100 (chipset)
G31 M7 TE motherboard
Powerlink LPK2-30 PSU
4 GB DDR2
Samsung HD502HI ATA hard disk
 
With the graphics card removed does the system operate as it should? I.E no more bluescreenies when the card is not installed?
 
Nope , it works sightly faster and I get blue screens only when I play games with better graphics (that's normal). But my curiousity is why it works like this? The motherboard has an 16x socket so it should be supported , and it needs at least 3 GB memory and 400W minimum power supply.
 
Should I make the tests with the graphic card installed or that isn't necessary?
(I pluged it in and out way too much times)
 
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Run a hard drive test first with out the graphics card installed, this will eliminate that component if it passes, then re connect your GPU and run a memory test as it will test both your ram and the video cards memory, if you detect errors run it again without the card and if it passes you have a faulty card if it fails faulty ram, process of elimination. its most likely to be 1 of those 3 components causing your blue screen, ram, HDD, GPU failing that possibly a bad driver? but you've done a clean install so that sorta eliminates software issues, good luck.
 
I had a problem with the HDD ( which proved it wasn't the problem) beceause it wasn't recognized by the pc. I tried to change the connector to another SATA slot and it worked.
Maybe that could be the problem that my pc was working slow with the new video card>?
 
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