Sophos keeps keeps shutting my (Snow Leopard) monitor down - but it doesn't lose power

I have a 3-year-old Intel Mac mini running OS X version 10.6.5. I have had 3 "anti-virus" programs running simultaneously on this computer:

•Sophos Anti-Virus for Mac

•MacScan

•AVG LinkScanner for Mac

When all three automatically start at boot-up, my monitor randomly goes dark - sometimes for 10 seconds, sometimes for up to 3 minutes.

Usually, to resolve the issue, I re-boot, only to have the issue recur.

I checked all connections and still have power coming to the monitor.

Turning off each of these three programs - one at a time - it turns out the culprit is Sophos Anti-Virus for Mac.

I was wondering if anyone could explain why. Is it that Sophos doesn't play well with MacScan and AVG LinkScanner? Is Sophos preferable to these other two? If I use Sophos alone, will it offer me more/better protection?

Thank you in advance for your knowledgeable response.

All the best, all the time,

Joel Kellner<>jerseyjoel@gmail.com

"There is absolutely no inevitability as long as there is a willingness to contemplate what is happening."