HP envy i7 with radeon 7670
I got rid of all graphics drivers and installed the 290. I got no display. no beeps, power supply is 600w high efficiency hp
there are no instruction with the card, although it is brand new. sapphire has no support contact on web page. what little pamphlet was there just said install the card, even though there are some power connectors that need to be connected to the power supply.
if I put back the 7670 I turn on and get an almost instant response on the monitor with an HP logo but with the 290 there's nothing and the power switch just flashes. again, no beeps, the computer sounds as if it comes up and runs normally. I've tried safe mode and low resolution mode to no avail and getting very tired of chaning that giant card out of there to replace the original.
any ideas would be welcome. I'll be back on tomorrow