Is it fine if I mounted my new power supply with different screws?

[AndreiArgeanu]

So, I just installed my new power supply as I need more power. The old one was the one included in my dell optiplex 7010. Now, instead of using the screws provided I wasn't really bothered so I used the screws that were already with the previous power supply. So the power supply is top mounted and I was wondering if there was a chance of it just collapsing inside? Everything is working fine so far and even after moving back to it's place there didn't seem to be quite an issue. I just need to know if it's fine

 

(Power supply is an EVGA 500W unit)

[r.b]

I would think that as long as the power supply is secure (doesn't move around) and the original screws that you re-used were not much longer than the newer screws (to the point where they can cause a short by touching the circuit board of the power supply), you should be fine.  Pictures may be beneficial for a better response.