Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!spool.mu.edu!cs.umn.edu!cybrspc!roy From: roy%cybrspc@cs.umn.edu (Roy M. Silvernail) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: System hangs - hard to restart Message-ID: <5eiX32w164w@cybrspc> Date: 2 Jun 91 19:24:15 GMT Article-I.D.: cybrspc.5eiX32w164w References: Organization: Villa CyberSpace, Minneapolis, MN Lines: 24 skipm@dorsai (Dorsai SysOp) writes: > Best way to > check a power supply is to use a multimeter, and look at the readings > off of one of the drive power cables. You should remember that most switching power supplies will not output anything if they are not loaded. This means you need to have _something_ drawing power from the supply, or it will shut down. A floppy drive will do the trick. I've seen people fooled by this effect several times. > On most power connectors, > black is ground, yellow is +5VDC, and red is +12VDC. It's best to check this carefully. I remember a Tandy supply that was exactly the opposite! (quite embarrasing to my ex-business partner, who hooked up a drive using the standard colors... in front of the customer who wished to buy the drive) -- Roy M. Silvernail -- roy%cybrspc@cs.umn.edu - OR- cybrspc!roy@cs.umn.edu perl -e '$x = 1/20; print "Just my \$$x! (adjusted for inflation)\n"' "What do you mean, you've never been to Alpha Centauri?" -- Prostetnic Vogon Jeltz