Bad solder joints are more common than memory training issues.

Yes, you can usually tell — and it’s almost always a bad solder joint.

Memory training issues are rare after a soldered RAM upgrade. They happen more with BIOS bugs or incompatible modules, not with soldered chips if you used the right specs. Bad solder joints, on the other hand, are the #1 cause of no-display after a rework.

Here’s how to tell: Watch the motherboard’s debug LEDs or listen for beep codes.

• Bad solder joint: Fans spin, maybe LEDs light up, but the debug LED stays stuck on CPU or DRAM immediately. No cycling, no restarts. The system just sits there dead.
• Memory training issue: The board will cycle through power states, sometimes reboot once or twice, and the debug