How critical is the silver pasted between CPU & Heatsink?

One more newbie question for today:
During my first build I had no-post problems initially. The D-Link card was lit up all 4 red. I removed & re-installed the cpu & cooler 3 times trying to absolutely eliminate the "cpu not installed correctly" possibility. I had read prior to removing the cpu that it was important to clean off the old paste and apply new paste, so -- since I am on a very tight budget and don't have any of that paste on-hand, I was very careful not to disturb the paste during the three removals/re-installations. So my questions are:
1) Is it absolutely critical to replace that silver paste?
2) What would happen if I didn't?
And the reason I ask is, I've been monitoring the temp of my CPU and so far it has never risen above 28 C (82 F). Of course I haven't pushed it hard yet... but I don't think my mom-in-law is going to be doing anything more that checking her e-mail and watching an occaisional DVD movie.
Do I need to go get some of that paste? I'm very hesitant to pop the case again, since everything is working and knowing my luck, I'd fry something.
Thanks
Blaine

28°C is absolutely fine .
Run som cpu stressing like 15-20 minutes and check how much it rises .
You can use several progs for cpu stress(100% loading) , prime95 is the one most used .
( can be downloaded here : http://www.mersenne.org/freesoft.htm )
Or you may use e.g superpi and select the longest run 32M .
http://www.xtremesystems.com/pi/super_pi_mod-1.5.zip
That will give an indication if it's acceptable as aicjofs says .
If cpu is below , say 45-46 °C during a longer 100% load it's fine and you shouldnt worry .
If it pass 50°C I would look at reapplying with quality TIM stuff like artic silver products .

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