HP claims that there are 2 connections off the 600 watt power supply to upgrade the video card. 1 is currently connected to an AMD HD7770 2 gig card. The other is open. Upgrading to an AMD HD 7870 2 gig card but when connecting the "other" open power supply connection, I get 5 beeps and will not boot. Is this the card or connection causing the problem?
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