Computer problems, please help :(
i need some help, well im dumb at computers so dont moan,
well, i have bought radeon 6750 XfX graphic card, so i took out my old graphic card, and i inserted the new one, i turned the computer on but there was no signal, i read the instruction once again and it said that i need 6 pin connector, so... i was looking for 6 pin connector but i couldnt find it, i just couldnt find it, there is only 4 pin connector hanging cuz its not connected to anything, my old graphic card didnt need any connectors you just instrted it in and it was working, so what should i do now ? should i buy a new psu ? or what :/
P.s
i just looked on the motherboard but there is none 6 pin connectors plugged in it ;(
help me please
well, i have bought radeon 6750 XfX graphic card, so i took out my old graphic card, and i inserted the new one, i turned the computer on but there was no signal, i read the instruction once again and it said that i need 6 pin connector, so... i was looking for 6 pin connector but i couldnt find it, i just couldnt find it, there is only 4 pin connector hanging cuz its not connected to anything, my old graphic card didnt need any connectors you just instrted it in and it was working, so what should i do now ? should i buy a new psu ? or what :/
P.s
i just looked on the motherboard but there is none 6 pin connectors plugged in it ;(
help me please

i dont really care... if i cant play it there is a lot of different games aswell