First post, by behshad
Happy New Year everyone!
Just before Christmas, I bought an AT-style Socket 7 motherboard computer and have been trying to diagnose and get it working. It wasn’t functional when I got it. The case had some rust, but the most concerning issue was the condition of the CPU pins—many were rusted and fell out when I tried to remove the CPU (photo: https://ibb.co/vP4BwJ3). The CPU was a 120MHz Pentium. I have replaced it with a tested and working 133MHz Pentium.
Now, the motherboard (MSI MS-5124 https://theretroweb.com/motherboards/s/msi-ms-5124-si7#docs) powers on and posts, but I’m stuck at PC Analyzer code 410d. Additionally, I hear continuous beeps that I cannot understand (video: https://www.youtube.com/watch?v=mLEab8Lyurk). I’ve tried booting with different RAM sticks without success. The CPU voltage is correctly set to 3.38V.
Motherboard Photos: https://ibb.co/QFYJzgM & https://ibb.co/S5Ky8zF
According to the PC Analyzer booklet:
- Code OD refers to detecting the CPU clock, reading CMOS location 14h to identify the type of video in use, and detecting and initializing the video adapter.
- Code 41 relates to initializing the floppy disk drive controller and any connected drives.
Nothing is displayed on the screen. While the CPU had visible rust, the motherboard itself shows no obvious signs of corrosion as far as I can see.
Does anyone know what these continuous beeps might indicate or have suggestions for further diagnosis? Any help would be greatly appreciated!