After upgrade it won't boot

I have a MBP Mid 2010 13 inch that we had at work that would not boot. I ended up erasing the disk and went out and bought Snow Leopard to install on it. Snow Leopard installed and booted fine but anytime I try to do the updates the system will not boot. I can the go back in reinstall from the DVD and it boots fine but of course without the updates. I have run the Apple hardware test and that did not find any errors.
If I have it go into verbose mode during boot the last thing that gets displayed is AirPort: Link Down on en1. Reason 1 (Unspecified)
The retail version of Snow Leopard that I bought was 10.6.3 and I tried to update to 10.6.8 and had the issue. Then I reloaded and tried again but just to 10.6.4 and had the same issue.
I have probably reloaded it 4 times now and changed the hard disk out for that last reload/update and it did the same thing.
I had hoped to put Lion on this but need to get it to 10.6.8 first. This thing is crazy frustrating..... Anyone got any ideas?
TIA

mwkirk wrote:
Link Down on en1. Reason 1 (Unspecified)
Sound like you have the old Snow Leopard "dropped Wfi" issue.
Seem the recourse is to flush your router and reset it.
Direct connect via ethernet cable to the modem
1: grab firmware updates for router (if not Apple) else Software Update and Airport Update.
2: WPA2 (AES) Personal 20 random character password, one each for Admin and Guest Internet access
3: leave MAC filtering and invisible alone, doesn't work against hackers, just causes connection issues.
https://discussions.apple.com/thread/2142725?start=495&tstart=0

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falconindy wrote:
briff wrote:After running a update to arch it gives me the following errors on boot:
After a partial upgrade... This is why -Syu is the only supported upgrade path.
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Enjoy!

Thanks for the post/tips newfocus, hope it helps somebody!

After upgrade it won't boot

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