Hi everyone... i have a problem with my computer . today as i am working in my company..all the sudden the red light under the mouse begin to blink after few second, i lose control of my mouse then screen lost its connection...then the keyboard...looks like everything were out of control..but the computer is still running, computer fan is fine....does anyone know the problem? i try to unplug and replug, shut down and restart...but no luck....any help would be appreciated thanx thanx

It this is a desktop or tower computer... Failing power supplies are common and can cause ALL your symptoms. Check your PS. See response 4 in this: http://www.computing.net/hardware/w... If the mouse is not USB connected, DO NOT unplug it or plug it in while the computer is running!

if that is a power problem, then the computer its self shouldn't be running too right? but it's running, and its tower type...and yes mouse is USB connected. thanx

The power supply has to supply several voltages. A single one missing or out of tolerance can cause a problem. If you don't get the normal single beep when you power on, that means the PC (motherboard) is not running.

its coming back to function from time to time....but the mouse has never come back to function......after few hours if goes off back to that problem again.... thanx

If the machine is still under warranty, you can obtain a power supply from Dell. Is this an Optiplex 270 or Optiplex 755 or Optiplex GX620 by any chance? Life's more painless for the brainless.

Failing PSs often still partially work. See the link to the info in response 1. All the fans connected to a computer I've seen use only +12v. The USB ports and devices, and anything connected to the PS/2 ports (e.g. a PS/2 mouse and/or PS/2 keyboard) and the serial ports (e.g. a serial mouse) all use only +5v. Hard drives, optical drives and floppy drives? use both +5v and +12v. I have seen the situation where the PS was putting out no +5v at all - the USB, floppy drive, and optical drive did not work, yet the hard drives and the mboard still did, and the mboard booted and still had video. After replacing the PS, the floppy and optical drive were still dead, and the video card and dial up modem card still worked , but both were damaged - the video had artifacts, and the modem would not connect - I suspect the voltage that was supposed to be +5v was too high before it produced no +5v at all, or there was a short that happened in the PS yet it did not completely die. The mboard, hard drives, and ram were not damaged. The original PS had a single fan with cheap sleeve bearings that was no longer spining - it probably fried itself. If what is supposed to be an accurate +5v is too low, your USB devices, PS/2 devices, floppy drive, and optical drives may not work properly, or at all; if there is no +5v none of those will work; if it is too high, the devices will be damaged in a short time and will eventually stop working. I've seen at least a half dozen computers this has applied to: Usually the floppy and optical drives die first if what is supposed to be +5v is too high - their led may still light up, they may still spin when you insert a disk, but disks in them are not recognized by the mboard or the operating system because the circuit board on them is damaged. You probably don't have to get a PS from Dell - in fact if it is a BESTEC PS DO NOT do that in any case. Dell has not used proprietary PSs - a PS with oddball wiring - for many years, unless this has a server mboard, and so it probably uses a PS with standard ATX wiring. If you tell us your Dell model number I can confirm that.