Loose, Crackling PSU Power Connection Causes Sudden Shutdowns—Should I Stop Using It?

The cable is the easiest thing to rule out, but do it only with everything unplugged from the wall. Try a known-good, correctly rated IEC power cable and check whether it seats firmly. If the replacement cable still wiggles or crackles, the PSU’s inlet is likely damaged. Either way, don’t use tape or continue operating it in a position that seems to work—the connection should be mechanically secure without that.

The fact that another device on the surge protector can trigger a shutdown points to an unstable power connection or a failing PSU, not a normal load issue. A lamp staying on doesn’t prove the connection is safe because lamps can tolerate brief interruptions that make a computer shut down. Treat the PSU and cable as faulty until proven otherwise and pursue the warranty rather than opening the PSU or trying to repair the socket yourself.

Stop using the PC and don’t keep testing the connection while it’s powered. Crackling at the PSU inlet indicates arcing or a poor electrical contact, which can damage the cable, PSU, or outlet and is a potential fire hazard. Since the PSU is fairly new, contact the manufacturer for a warranty replacement and explain that the inlet is loose and produces noise when the cable moves. Replace the AC cable too if there’s any sign of damage, discoloration, or a poor fit.