I recently purchased a Gateway Essential 500 from eBay to make my first Windows 98 project box. Which worked perfectly fine, until I attempted to replace the NVIDIA Vanta 8 MB that it came with, with an FX 5200 128 MB that was laying around in an XP machine that I had tested to work with that machine. That being said, when I installed and connected it through VGA, there was no input/display on the monitor and the motherboard during POST gave me one long beep, followed by two short beeps, seeming to be a VGA output error. After that, I replaced the 5200 with the Vanta that was initially in there, only to get the same results. I checked the motherboard and AGP slot for any physical damage which I could not find any. After attempting numerous reseatings of the Vanta, I cleaned the connectors on it with isopropyl and cleaned the board with compressed air to no avail. I have been planning on getting a PCI card, but want to see if there is anything else I could do or at least know for sure that the AGP slot is damaged. Thank you for taking the time to read this.

Gateway Essential 500
RAM: 128 MB
GPU: NVIDIA Vanta 8MB
Audio: Sound Blaster Live! CT4780
HDD: IDE to microSD - 128 GB
PSU: 200 W