Yesterday I thought I saw smoke coming out of the power supply unit. My computer was running on UPS power for last 5mins and I was just shutting it down. After about 15 mins I rebooted. The computer seems to be working fine. Intel desktop tools show correct voltage on all rails. The temperature of CPU, HD motherboard are all right as per Intel tools and HDD sentinel. Problem is I can still smell acrid smoke around the computer. Can see no smoke right now. I am afraid to keep the computer on for longer period of time. Can someone please guide me on how to test the PSU or am I being paranoid.