This is a strange problem. I have replaced the Power Supply already. The optiplex case hinges open, and when I leave it open all runs well. But if I close it completely, the power button flashes an amber light. I have swapped out the ram. After I changed the power supply the PC ran great for 1 week, then I went to turn it on again and there was that flashing amber light which by the way stays flashing after awhile even when my power cord is disconnected. If I have the power off and I close the case gently, it will power up fine, but it's a hit and miss situation. So right now I have the case open about a half inch and it's running fine. Anyone had this problem before? I also checked the temps and it is 48 degrees Thanks Some HELP in posting on Computing.net plus free progs and instructions Cheers

Dell? OptiPlex? GX270 Service Manual http://www.sayresd.org/technology/t... Your case has a Chassis Intrusion Switch. - The power led may blink depending on a setting regarding that switch in your bios Setup, when the case has been opened and then closed again. - The switch may be defective, or it may have gotten displaced from where it works properly. If it's defective usually if you disconnect it your problem goes away, but there may also be a bios setting you need to disable. Chassis Intrusion Switch http://www.sayresd.org/technology/t... ....... Dell? OptiPlex? GX270 Systems User's Guide http://support.dell.com/support/edo... Solving Problems http://support.dell.com/support/edo... Diagnostic Lights System Lights Blinking yellow A power supply or system board failure may have occurred. See "Power Problems." Did you replace the PS with an el-cheapo one? Don't buy an el-cheapo PS. See response 3 in this: http://www.computing.net/answers/ha... ....... "...that flashing amber light which by the way stays flashing after awhile even when my power cord is disconnected..." The power supply has large capacitors in it that store a charge - it takes a short while for them to discharge after having removed the AC power to the PS.

Thanks a bunch for that great info Tubes! It's much appreciated. I disabled the switch in bios but when I closed the case I still got that dreaded amber blinking light. So I once more opened the case about 1/2" and all is well again. Maybe I should remove that switch? The power supplies I got are an origional Dell part. I bought my Optiplex on E-bay, the guy had a bunch of PC's he was selling, so he sent me 2 more working power supplies for an additional $10. I also did all the trouble shooting on the amber blinking light. As long as I leave the case open about 1/2" it runs great. I also checked the MOB and didn't see any bulging capacitors. Some HELP in posting on Computing.net plus free progs and instructions Cheers

Look at the Chassis Intrusion Switch info link again - see the end of that - try closing the case then resetting it in the bios - if that doesn't work, remove the switch from where it's mounted so it can't come on, or disconnect it's wiring. I think closing the case closes the switch (turns it on; completes the circuit), same as for a keylock switch.