I was installing the heatsink on my retail XP 1800+, and when I first tried to press down the clip, I found that I needed to move the heatsink a bit so the first clip would be latched securely. When I removed the heatsink, a bit of the thermal pad material had already gotten on the CPU. I got the heatsink on ok the second try. I haven't powered up yet - am I OK, or do I need to remove this thermal pad material and start over?