Computer not booting up means LEDs flash for a sec and then nothing after that. I have to manually shut off power toggle on PSU, wait for motherboard LED to go out and then I can attempt power up again. PSU is a 1200W Thermaltake.
I have a total of 3 monitors. But for right now, I am using 2 monitors due to fact that I mistakenly bought a passive DP : HDMI cable.
I have tried only one monitor. Connections are DVI-D, HDMI and DP : HDMI (passive apparently). It only won't boot up on cold start with cables plugged in. Restarts are fine. Old card was a 5870 that I always ran the three monitors with using eyefinity.
Note: I totally forgot to uninstall the 5870 drivers. I feel dumb now. So, do I need to uninstall 6950 drivers and then reinstall 5870 gpu hardware, uninstall those drivers. From there, reinstall 6950 gpu and install drivers. Would this be source of problem?
No it wouldn't be, the PC is not booting at the first place, drivers issues are related to windows environment.
Are you sure you hooked up the PCIE connectors ?
Right now try a single monitor with DVI/HDMI cable and see what's going.
Okay, I did everything that everyone suggested. Removed battery for 1 hour and also reset jumper. Bios restored to default and booted with only one monitor (DVI-D).
I then booted with two monitors connected (DVI-D and HDMI) and no problems. My feeling is that either I didn't uninstalled old 5870 drivers or card was seated properly (which I removed and ensured it was secured). My other suspicion is the passive DP cable suck!! New active cable on order, we'll see.
In the end, I think that the cables are bad or the card wasn't seated properly and may have been shorting out or something. Thank you for the help!