When I connect my iMac to a hdtv, the screen goes white with snow

When I connect my imac to my samsung hdtv through DVI miniport to HDMI on the tv, the connection is fine for about 10-15 minutes and then goes white with snow. I had a macbook pro before and used to use the same connection on the same tv and it worked perfectly fine. Please help

Nope it won't do that on the mid 2011 iMacs. What you're trying is called Target Display Mode, the only way it would work is if the PC has Thunderbolt (which no PC has) and you use a Thunderbolt cable.
What  you can do is hook up to two external monitors on your iMac (giving it up to 3 monitors) which is very cool and can improve productivity depending on what you use your iMac for.

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    Hi , and a warm welcome to the forums!
    Could be many things, we should start with this...
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