so i had a computer that worked great then i got a awesome new case i transfered everything over and it didn't work so i transfered everything back and now even though it turns on, i turn on my moniter everythings plugged in. I turn on my computer and... nothing complete blackness not even a no signal sign. I know it's not a problem with the moniter because i tested it on another computer. Please help (can provide more information about computer if necessary)