Hi techies! Hoping to seek some advices here. First, thanks in advance for the welcome wishes Feel at home already. I have installed the above graphics card to my system and been running for 3 days (since Wednesday). Updated its driver + installed Catalyst on Wednesday from its website and no changes since. Everything seems fine until this morning -- no display. Monitor says "No signal input" I hope you can make something out of this. Before the new graphics card, I have the following: 500W PSU ASUS P5B Deluxe motherboard (1 PCI-e slot) 2 GB RAM 500 GB SATA HDD 500 GB SATA HDD XFX nVIDIA GeFORCE 9800 GT 512 MB Intel Core2 Duo E6600 @ 2.40GHz These have been running without problems for over 2 years. I recognized that the HD4870 requires a minimum of 500W PSU, which I think is fine as I do have it. When I switch on my system this morning fans, lights, everything else is fine... just that the screen says "No input signal". Connected display with laptop and it works. So here ruling out fault monitor. Put back old graphic card (the GeFORCE 9800 GT). Nothing. Same message -- "No input signal". I'm stucked. Help?