1 We have some laptops needing to be fixed.
2 We have some laptops needed to be fixed.
I was told that 1 means that the laptops are still in need for a fix. 2 means that the need to fix them was in the past.
I construe that "needed" is a participle. What if we switch the sentences into the past?
3 We had some laptops needing to be fixed.
4 We had some laptops needed to be fixed.
3 means that at that time we had some laptops that needed to be fixed.
But what about 4? Is it correct? What does it mean?