I have a Gateway lx6810-01 desktop. I started off having problems with random shut-downs - so bad that sometimes it wouldn't even complete booting before a shutdown (only sometimes was it that bad, not always , but I couldn't figure out why it did this only sometimes). I read that my particular model desktop is notorious for random shutdowns, so I purchased 2 case fans and 1 PCI sIot fan with hopes the added circulation would fix the problem. I installed the new components, however when I started the system back up, all the fans came on but no beeps during startup and no display on the monitor.
My first thought was graphics card failure, so I swapped the card with a card from another computer I knew worked. That didn't fix anything, same problem. Next I thought somehow the motherboard failed. Replaced the mobo. This didn't remedy the new issue either. What else could cause the computer to not beep, but all fans come on, and no monitor display? Prior to adding fans, I had a display. When I replaced he mobo, I didn't hook the new fans up just in case the fans had blown the previous mobo, so I now ruled out the fans as the culprit.