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Ok, I'd just like to say this problem is fixed, but I want to know why the crap it happened in the first place...

Ok, This was at my job over the summer, and it still drives me crazy as to why... We were working on a computer, and got it nearly fixed, but then the next day it wouldn't turn on. Fans would startup and disks would spinup and such, but no video, no BIOS beeps, no LED activity...

So, we tried everything, new RAM, new video card, new PSU....nothing would get it to show video...

After hours of trying to get it to work, the person working on it had given up saying a bad mobo...

I usually don't like for things to just be assumed, so I took abotu 30 minutes to try to get it to work...(mostly out of boredom and enjoying problem solving..) so, I tried removing CMOS battery...changing a jumper to "clear CMOS" and then changing it back....nothign was working...

then, just out of curiosity, I looked at the back of the PSU, the voltage switch was set to 120v(the correct value, we are in the US) so I just tried flipping it to 240v randomly... then, I flipped it back to 120v and it turned on, video worked, and we had no problems with it....it was the weirdest thing ever...

anyone have any idea why the crap this happened?

Gremlins? Bad/cheap products? The power supply believed it was set to 240? The devil possessed it? Solar Flare? Gamma radiation? Hand of God? String theory? Tiny black/worm holes? Aliens? Tear in the fabric of space time?

I could go on and on!!

frank wrote:Gremlins? Bad/cheap products? The power supply believed it was set to 240? The devil possessed it? Solar Flare? Gamma radiation? Hand of God? String theory? Tiny black/worm holes? Aliens? Tear in the fabric of space time?

It was obviously String Theory. Due to the vibrating strings in the computer, the switch actually was at 240v, but it only seemed as though it was at 120v.

The only solution to this problem would be to go to another dimension, and look at it from another point of view.

Hm.....Issuesy power supply......

Maybe the power supply wasn't giving power to all of the motherboard?

-JL

The switch obviously knew it was stationary. As it knew its velocity, it obviously couldn't know its position at the same time. By moving the switch, you measured its position and it works ok. Of course, now you have no idea how fast it's moving...

Adam

If the power supply was set on 230V, and you were running on 120 volts... okay, but if you we're running on 230 volt supply set up with an 120V PSU... ... I tried this when I was more younger, you know the old casette recorders? I flipped the little switch up, and in less than 5 seconds it was own3d, the whole thing almost melted

You say PSU was the problem? A testbed of mine didnt work, no video, no bios beeps, but harddisk would spin and LEDs on the front panel were working. I threw the old PC up, including the mobo, excluding PSU, RAM, LAN card etc., In my case the mobo was faulty.