Bad PSU or GPU?

[Diego -insert nickname-]

Just finished my scavenger pc, installed windows 7 64 bit but i left the card in the pc but without the pcie power cable (was using on board igpu), installed the drivers and when i was about to install geforce experience, it said no compatible card found, connected the pcie cable back (woops) tried again and the same, the gpu fans run at max when i start it up and i remembered the gpu worked before, i checked the voltages in speccy and the 3.3 volts were at 3.3, 5v at 3, 12volts at 3,but the system ran stable? isn't it supposed to not even turn on it those readings are true?

Edit: forgot my pc specs.

CPU: Intel i3 4150
MOBO: Gigabyte GA-B85M-DS3H-A
GPU: 550 ti 2Gb
PSU: ULTRA LSP series v2 professional 550w (i think, reference image from ebay: http:// , sorry if this isn't the correct way to share an image for reference.)
RAM: 2x2Gb
OS: Windows 7 64 bit
HDD: 320G 7200rpm main drive
2nd HDD: 1T secondary drive

 

[Dark Lord of Tech]

Take out the CMOS battery for a minute then hookup everything again , restart computer.

 

[sizzling]

If the 3v on the 12v rail was true I doubt your HDD/SSD would opperate

 

[Diego -insert nickname-]

i don't know if i had to disconect the power but i turned it off and removed the cmos battery and left it off for over 5 minutes, plugged it back, onboard video loads fine, gpu doesn't display

 

[Diego -insert nickname-]

Does anybody else know what it could be? starting to think i have to re-install, i also have pictures of the side sticker of the psu and speccy, how do i upload them here so you guys can see?

 

[Diego -insert nickname-]

letting you guys know it's a faulty gpu, i guess it shorted out on my previous atempt with another cpu+ mobo, thanks for all the help guys!

p.s. how do i close this thread?