no video from newly built PC

[Guest]

i just put together a gaming pc but there's no video, im quite new to computer building but i have made some theories of why, if any of them make sense or if you have any other ideas PLEASE let me know.

All of the components work i believe (all the fans turn on and i know the monitor works) but my case is quite small (rosewill challenger) and my gpu is bit (powecolor r9 390), when i put the card in, i had a hard time fitting it but i eventually got it, BUT it is tilted up a littlebit, and Im fairly certain that it is in all the way because i was able to lock it back in. i saw there was a switch on the gpu, i tried turning it on with the switch one way that didnt do anything so i moved the switch over and fired it up but there was still no video.
I was also thinking that but maybe the cpu was DOA or something, there are no other computers i can try the parts on.
Any help is highly appreciated.

 

[Xuebao61]

Do you have at least a 750W powersupply?

 

[ss202sl]

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[Xuebao61]

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

That too.

 

[Guest]

Do you have at least a 750W powersupply?

every forum ive seen online says that 750w is more than you need for this card and says that a 600w psu will do just fine, i have a 600w psu

 

[Xuebao61]

every forum ive seen online says that 750w is more than you need for this card and says that a 600w psu will do just fine, i have a 600w psu

Have you made sure the power connectors for it are firmly seated? And check that link that was posted, it could be helpful to you.

 

[Guest]

every forum ive seen online says that 750w is more than you need for this card and says that a 600w psu will do just fine, i have a 600w psu

Have you made sure the power connectors for it are firmly seated? And check that link that was posted, it could be helpful to you.

i tried everything that was suggested in that post, but nothing has changed, all the cables are firmly in place, would it have anything to do with the crooked gpu? its in the motherboard pretty good and its tightly screwed to the case

 

[Xuebao61]

i tried everything that was suggested in that post, but nothing has changed, all the cables are firmly in place, would it have anything to do with the crooked gpu? its in the motherboard pretty good and its tightly screwed to the case

It could be that, in that it being crooked is not having all the connectors touching in the PCIe slot.