Windows 10: PC wont start up.

So, for context, I decided to conect a nvidia 9500GT on my pc to use a second monitor without taking any performance from my integrated graphics. The problem is that, the moment i pressed the power on button, it kept rebooting, it would turn on the fans for a second or two and then restart the process, turn off and turn on, it wouldn't go into bios. Noticing this I disconected the GPU and tried turning the pc on, but it doesn't give any video output, nor would the usb ports work. I tried removing the ram sticks, tried taking off the CMOS battery but no difference, the same with disconecting al

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Got my new PC but it wont turn on...

well im starting back up on it now and I have no clue why my pc wont at least show me bios or anything its not even a blank screen just video isnt detected, any suggestions?

 

pc wont start

help me., my pc wont start, when i press the on button the power led just blink once
All the fan working fine
Can some1 tell me what is causing the power led blink just once when i try to on the pc?

 

PC shut down, wont turn back on

The fan twitch is it powering up and then the psu is noteing a short and cutting out hence why it wont do it again straight after until it's reset, something is blown or shorted out so you need to do as someone suggested and split the pc out then, on a table build the minimum up as he said and step by step see what's happening.