From the BEEP code you indicated..
1 long, 2 short, 3 short ...
are you sure??
IF
1 long, 2 short, 1 short or long
that would indicate a VIDEO card not seen error. This would mean EITHER the card is bad OR the card's bios is not correctly seen.
Remove your Network Card ... see if the video returns.. if it does, then the two cards are trying to use the same address range, and the NIC is winning.
If taking the nic out doensn't change the beep code, try removing the video card, see if the beep code is still the same.
If still the same then you need to try another video card. IF the beep code changes when you pull the video card out, then it *is* being seen and the beep codes become very important.
Another VERY commonly used beep code... for system memory is long beeps, repeating constantly.
long beep long beep long beep (continuously)
reseat your main system memory.. then try booting and see what happens.
lastly... since the others are just as easy to do... you should check Gateway's web site to see if they have a listing of the BEEP codes for your system. if the two I've given don't sound anything like what you have.. Gateway should have the beep codes listed or available from their support line.. and they are always happy to help.
Our company bought some 2nd hand 200 MMX gateway's and even though the serial number wasn't registered to *us* they still helped us anyway.
-T