The BluTek Power BPA‑R850‑050BA2 is a rack‑mounted, single‑phase switching power supply rated at 850 W with a 7 V/100 A primary output and a 5 V standby/2 A secondary rail. Common failure modes for this model include input voltage spikes causing the internal PFC circuitry to fail, output short circuits due to degraded capacitors or transformer winding insulation, and overheating of the power transistor stack leading to thermal shutdowns. Initial diagnostics should verify that the unit receives 100–240 VAC within spec, measure the primary and secondary output voltages for correct rail levels, inspect the PCB for burnt components or cracked solder joints, and review any error codes or status LEDs displayed on the front panel.[oss-gpt-20b]