OK, you need to reseat the HS - don't do any testing.
You only need a rice/pea sized blob in the middle of the cpu - and then fit the HS on top.
You can use the computer straight away as the AS5 will cure after few days usage (supposedly).
If you only want to spend a minimal amount the Cooler Master Hyper 212 is a great cooler for the money - and comes with pre-applied paste - link
One final thing - how did you clean the HS and the CPU before applying the AS5?
I used akasa tim clean and I applied some it to one of those ear bud things and wiped on the cpu and heatsink,I also used a cloth that my dad uses to clean his glasses with.
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