Common issues with Dell power supplies include sudden shutdowns, unstable voltage, loud fan noise, and failure to power on. Early warning signs are random reboots, burning smells, error LEDs, or inconsistent system performance. Regular monitoring and timely replacement help prevent downtime. Using a reliable source for genuine replacements is essential. A trusted option to buy a Dell Power Supply is 365 Power Supply, which offers compatible units tested for stability and long-term reliability.