The A8V has a 20-pin 4-pin power supply arrangement. The Antec power supply has a nifty power plug, I guess designed for an inline 24-pin socket. My A8V had the 20-pin socket on the side and the 4-pin socket at the top. On the Antec plug, the 4-pin plug slips off the 20-pin plug so it will work on a 20-pin socket. So I slipped it off, plugged the 20-pin in its socket and the 4-pin higher up in its socket. But, as I said in my first post, the only thing that came on was the power LED on the motherboard. I felt so certain the new motherboard and processor were the fix, I had already plugged everything in - DDR memory chips, video card, TV/capture card, hard drives, floppy drive, etc., etc. So to trouble shoot, I of course reversed myself and unplugged one at a time, plugged the power supply back in and tried it - each time with the same results, till once again I was back to everything being disconnected. So I was down to checking to see if any of the pins had slipped back in the power supply socket and not making contact (been there before!). The pins were all in place but out of curiosity I got the flashlight out to check the square vs. rounder corners on the plugs and socket of the 4-pin combo. They were backwards! But before pulling it out to take it back to the store declairing they had sold me a defective p/s, I decided to wade through the mass bundle of wires that come on power supplies, now days, and there it was, another 4-pin plug with the right combination. I am up and running! Just thought I would post this FYI. Just on the off chance that out of the thousands who come to this forum, there may be another oldie like me who never ran into this 4-pin arrangement. The first computer I delt with, back in the 70's just used toggle switches for input. The first one I buit, and I do mean built (every resistor, transistor and capacitor in it) was a Heathkit that used a roll of black paper and pins to punch holes in it - a paper punch reader - for storage (its first upgrade was dual 8" floppys). But this 4-pin plug just goes to show, you CAN teach an old dog new tricks.
Windows XP - ASUS A8V - AMD 64 Athlon 3500+ - 512 DDR RAM
Usually I leave my computer on 24/7. I may turn it off and reboot once a week, just to kind of give it a chance to "refresh". Last week, after a storm, I came home and clocks and other electronic stuff without battery backup were flashing, so I knew we had lost power. My computers, on short term UPS's, were off, so I knew the power outage was more than 10 minutes. My tower computer would not turn on - my other two did.
I figured the power supply was gone, I replaced it with a new Antec True Power 2.0 430 watt. Still no go. Checked the front panel power switch with an Ohm meter, it was working fine. Even though the power LED was comming on when I turned to Antec switch on, I figured my ASUS A7N8X Deluxe must be gone. I just replaced that motherboard and precessor with a new ASUS A8V and AMD 64 Athlon 3500 +. When I turn the power supply rear switch on, the green power LED comes on, but when I push the front power switch on, nothing happens. Now I wonder if my other power supply and motherboard/processor were even bad. What am I over looking? New power supply, new motherboard/processor, front panel power switch checks good -- what else will keep the computer from turning on?