Got brand new everything, i plugged everything in but the computer wont start up. the motherboard lights up a red light and a smaller green light but when i push the power button nothing happens. Also my screws arent tight the motherboard just wont tighten down. i have a geforce 8200 motherboard. i know i have all pwoer connectors in right. do you think my motherboard is fried? it still light up though

Also my screws arent tight the motherboard just wont tighten down. I cannot help you with any lose screws you have, but some electronic boards use the mounting screws as a way to complete the circuit to ground, hint, hint.

Did you bench test all the hardware before assembling the machine? This is really a hardware question and should have been posted in the appropriate (General Hardware) Forum. "So won’t you give this man his wings What a shame To have to beg you to see We’re not all the same What a shame" - Shinedown

The mainboard requires standoffs from the case. Sounds like you are trying to screw the mainboard directly to the case. In the old days this would have resulted in a blown board the second you put power to it. These days there is built in detection which is why it doesn't start up.

And make sure that you only install motherboard standoffs to align with screw holes in the motherboard.

i got all the standoffs in, and all the screws in the standoffs. their just a little shaky. do you all think this is the problem? should i reinstall them to a better fit? and what do you think about my motherboard is it fired if it light up?