Some day I had brilliant thought let's go wild sell this old GeForce 2 Ti crap and buy something brand new. Like I thought that I did and bought Gigabyte Radeon 9550 128 Mb/128bit. I got the card plug it in and..none. System didn't boot up and I don't mean that Windows did not want to start I just got blank screen. Monitor didn't respond like it had no signal from the card. I thought "Ok, maybe I've got not enough power". So I plug out all power connectors (from disk, cd-rw, even from floppy). I tried again and still nothing's happening. Then I cleared CMOS and voila! Monitor turned on and system booted up normally. I installed drivers, enjoyed for a while, then turned out my comp. Later I tried to turn on my computer but it's happening again and I mean nothing happens. Resetting BIOS one more time was of no use, didn't work. I turn power on, hear all drives, all fans are working, but nothing happens, monitor still remains blank, I almost forgot I don't know if it's important but I don't hear PC-speaker. Now that's how I recognize when my computer starts up: When I hear sound from PC-speaker it means that eveything is fine and comp will start, when I hear nothing except fans then I know that it won't start. He can "refuse" to start for couple of hours and then suddenly he starts and boot like nothing happened. I don't know what's the problem, maybe my mobo needs to be updated? My mobo is ECS K7VTA3. I checked ATI site and Gigabyte too but I didn't find anything useful. If anyone is able to help I would be really grateful..