Refurbishing a Tektronix TDS7104 Oscilloscope

The author bought a Tektronix TDS7104 for $300, a 4-channel, 1 GHz oscilloscope that initially powered up but later stalled at the BIOS screen due to a CMOS battery error. By replacing the dead PC motherboard battery and addressing a failing hard drive, the scope was restored to full functionality, confirming its 10 Gs/s single-channel capability and compatibility with standard BNC probes.