Can't screw heatsink back down

[missingno90]

Basically, my CPU was running hot, so I cleaned the heatsink and cpu fan, and reapplied thermal paste.

Job done, but now I can't screw the heatsink back down. The screws have little spring things on them, and I'm not sure if those have something to do with it.

Please help! D:

 

[COLGeek]

You have to apply some pressure and push in the screws enough to catch the backplate.

 

[missingno90]

You have to apply some pressure and push in the screws enough to catch the backplate.

I've had a look ay my mobo without the heatsink in place and 2 of the holes have nothing to catch on to. I can see the threads fine in the other 2, though.

 

[COLGeek]

Then something may have fallen off when you detached the heatsink.

 

[missingno90]

Then something may have fallen off when you detached the heatsink.

Yeah, I managed to find the hexagonal things with the thread for the screws inside the case. However, they're terribly loose even when I try to put them back in place, and just fall out of place again.

 

[COLGeek]

What make/model is your heatsink?

 

[missingno90]

What make/model is your heatsink?

Antec 650 H2O Kuhler

 

[COLGeek]

Those shouldn't fall out. Check the manual (see below) to ensure you have the backplate installed correctly:

http://www.antec.com/pdf/manuals/Kuhler_H2O_650_Manual.pdf

 

[missingno90]

Those shouldn't fall out. Check the manual (see below) to ensure you have the backplate installed correctly:

http://www.antec.com/pdf/manuals/Kuhler_H2O_650_Manual.pdf

The backplate looks fine, and the things are poking through at the correct place on the motherboard.
Everything was fine for 3 years until I took the screws out. Lol

Edit: I held them in place as I put the screws in without the heatsink. One holds solid in place, the other 3 just come loose and move with the screw.