Having problems with your PC Desktops ?

CPU doesn't turn on!!

\015 I have a Compaq Presario SR1123WM and when I plug it in, nothing happens. The green light on the back of the tower blinks continuously.\015

Answers :

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    • \015\012\015\012Power supply light on or flashes\015\012Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:\015\012\015\012\015\012\015\012\015\012\015\012\015\012CAUTION: \015\012This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.\015\012\015\012
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      1. \015\012Disconnect everything from the computer, including the power cord.\015\012
      2. \015\012With the power cord disconnected , press the power button on the front of the computer for five seconds. \015\012Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.\015\012\015\012\015\012\015\012\015\012\015\012\015\012NOTE: \015\012If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply\015\012
      3. \015\012With the power cord removed, flip the red voltage selector switch to the opposite position. Wait about five seconds, and then switch the red voltage selector switch back to its original location. Ensure that the voltage selector switch is on the correct setting, 115V for North America.\015\012Performing this step ensures that the voltage switch is engaged and set correctly for your country/region.\015\012\015\012Figure 4: Voltage selector switch c00517964.jpg\015\012Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.\015\012
      4. \015\012Plug a lamp into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both to see if the wall outlets have power.\015\012
      5. \015\012Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it.\015\012\015\012\015\012\015\012\015\012\015\012\015\012NOTE: \015\012If you find the device that was causing the problem was a surge protector, resetting a breaker or fuse on the surge protector may fix the issue.\015\012
      6. \015\012Remove all attached devices except for keyboard, mouse, and monitor.\015\012
      7. \015\012Remove any internal component that was recently added, such as video card, memory, CD, DVD, and hard drives. An added device may take more power than the power supply is rated for. If the problem goes away when the component is removed, the only option is to upgrade the power supply to power supply with a higher wattage rating. \015\012
      8. \015\012Check the power switch: \015\012
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        1. \015\012With the power cord disconnected, press the power button on the front of the PC. The button should release easily and not stick in the socket.\015\012
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          • \015\012If the button sticks, it should be replaced or serviced.\015\012
          • \015\012If the power button does not stick and appears to be functioning, continue using these steps.
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        2. \015\012With the power cord disconnected, remove the case or side panel.\015\012
        3. \015\012Follow the wires from the power button on the front of the computer to their connection on the motherboard.\015\012
        4. \015\012Look at the power switch cables connected to the motherboard. If the cable has become disconnected, connect the power switch cable connector to the connector on the motherboard.\015\012\015\012Figure 5: Power switch connector on Motherboard c00517968.jpg\015\012
        5. \015\012Replace the side panel, plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
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      9. \015\012Find the defective part: \015\012
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        1. \015\012With the power cord disconnected, remove the case or side panel.\015\012
        2. \015\012Disconnect all power cable connectors from their connectors on the motherboard and from the back of internal devices (the back of drives). Make sure to label or remember where each cable connects for future reference.\015\012\015\012Figure 6: Example of common power connections c00540428.jpg\015\012
        3. \015\012Replace the side panel, plug in the power cord, and examine the light on the back of the power supply:\015\012
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          • \015\012If the LED is on solid and is not flashing, the power supply is probably good and the problem is most likely caused by a defective component (processor, memory, PCI card) or a defective motherboard. Have the computer serviced, or remove the components and replace them, one at a time, to find and replace the defective component.\015\012
          • \015\012If the LED is still flashing (it should not flash with all connectors removed), plug the power cable into a different power outlet that is known to be good. If the LED still flashes, the power supply should be replaced.\015\012
          • \015\012If the LED light is now off, plug the power cable into a different power outlet that is known to be good. If the LED stays off, the power supply should be replaced.
          \015\012\015\012\015\012\015\012\015\012\015\012\015\012NOTE: \015\012If an electrical storm or power surge has recently occurred, then it is more likely that the power supply, the modem, or motherboard is damaged and requires replacement. If the power supply was damaged due to power outage or storm, this may not be covered under the "act of nature" policy in the warranty statement. Refer to the warranty statement that came with your computer for more information.
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