I Spent Days Fixing This IBM Server. The Problem Was Embarrassing

This IBM Netfinity 3500 should have been an easy project. It was a classic late-1990s business server, exactly the kind of machine I love working on, and the plan was simple: get it running properly and install Windows NT Server. But almost immediately, it started behaving strangely. The BIOS settings didn’t seem to make sense. The floppy drive caused confusion. The processor speed looked wrong. The SCSI controller seemed suspicious. Every time I thought I had found the problem, the machine gave me another contradiction. For a while, I thought this server had several different faults. It didn’t. The real answer was much smaller, much simpler, and much more embarrassing. This is the full troubleshooting story of the IBM Netfinity 3500 a vintage business server that beat me for longer than I care to admit TimeStamps 00:00 Why the Netfinity 3500 00:46 Inside the Chassis 01:03 Power On 01:37 Reseat CPU and RAM 02:30 First time in the BIOS 03:30 Replacement CPU 04:07 Cache Detected 04:40 SCSI Hard Disk 05:40 SCSI BIOS 06:20 IBM ServerGuide CD 07:57 Disk Write Error 09:00 Replacement Floppy Disk 09:41 Winging it 10:25 No Network Card in NT 11:29 Chassis Documentation 12:48 DIP Switch 14:00 Reverse Switch 15:09 IBM Diagnostic Floppy