i recently took out my ram and such and dusted my internals but i have a problem

I put everything back where it was before even added a new video card but when I try to start the pc this happens ad there is no image or lights on peripherals

https://www.youtube.com/watch?v=GFas...e_gdata_player

I don't know.what this means or what to do.

Pc is an acer aspire m4300-b4052