Just now I plugged one of the HD4870's in the system (HD3870X2 is still set in primary PCI-E slot and monitor is connected to it and CAT's 8.6 are installed (but for some reason CCC won't start now at all???)) and I have no 6-Pin PSU cables connected to it... system booted into windows... I got no warning about cable not being plugged in... the HD4870 hardware got recognised and windows started installing the driver for it... and then whole system just stopped and monitor screen got black... same as always... I have to now boot in Safe Mode, disable the HD4870, to be able to boot into windows again... or uninstall Catalyst drivers... what a pain...
EDIT: like all of you I also get only 3 red lights lit up on system restart (on tha image light that doesn't lit up is labeled D601 - second from top - located right side, right next to the 6-Pin PSU connectors) and this seems to regardless if I have the PCI-E power cable connected or not...
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