The front light of my desktop computer blinks red every 2 seconds and the computer won't power up. On the advise of a local computer tech, I replaced the power supply with a new one direct from HP Compaq but the computer still won't power up and I still get the blinking red light. What else could be causing the computer not to work? Please help. Thx.
Hi. The first thing you should always check is that all of the wires and connectors are in good shape, making contact where they should, and not shorting out anywhere. I know this sounds simplistic but the way these things are assembled these days with the wires just barely long enough to get to their destination they can pull apart, wear if there is vibration (causing shorts), or even pull or lift solder joints off of the circuit boards. You can test to see if the PSU needs to be connected to the motherboard at the ATX connector by plugging the PSU in and trying to turn it on without being connected to the board. I have found that the PSU generally must be connected to the motherboard in order to work. There was one I had worked on a long time ago that didn't require to be plugged into the motherboard, I think it was a Pentium 2 and it was a very long time ago. Your PSU probably does need to be connected.
If you have a battery backup, Uninterruptable power supply connected, disconnect it. You may well have a bad UPS. Even if you disconnect the UPS and test the voltages it doesn't matter as what you are measuring is not under load. I have seen a bad UPS prevent a computer from working and when it was disconnected the computer was fine. However, if a bad UPS remains connected too long and the computer suffers BSOD or crashes often they can ruin the motherboard.
Well I hope this helps you. It is a decent way to begin to troubleshoot many PSU problems. One other thing, don't forget to use your nose. You can often smell burnt components. If you smell fowl burnt plastickind of oder then try to locate where it is strongest and then look for signs of heat or fire, like blackened circuit board, wire, or components. Good luck. Greg
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Power Green On (S0) Computer on
Power Green 1 blink every 2 seconds (S1) Suspend Mode
Power Green 1 blink every 2 seconds (S3) Suspend to RAM
Power Green Off (S4) Suspend to Disk (if applicable)
Power Clear Off (S5) Computer off
Power Red 1 blink followed by 2-second
pause - Repeat
Power Supply failure
Power Red* 2 blinks 1 second apart CPU thermal shutdown
Power Red* 3 blinks 1 second apart CPU not installed
Power Red* 4 blinks 1 second apart Power supply overload (crow bar)
Power Red* 5 blinks 1 second apart No memory
Power Red* 6 blinks 1 second apart No graphics
Power Red* 7 blinks 1 second apart System board failure (detected prior to video)
Power Red* 8 blinks 1 second apart Invalid ROM
Hard Drive Green Blinking Hard drive activity
How many times does the red light come on ? It should blink a number of times, then go off for a little while, and start blinking again. The number of blinks within each cycle will help you find out what is wrong:
Number of 1-second red LED blinks followed by 2-second pause, then repeats:
2-processor thermal protection activated
3-processor not installed
4-power supply failure
7-PCA failure (ROM detected failure prior to video)
8-invalid ROM, bootblock recover mode
I have the model Philips 37PF7320A/37 won't turn on and MOST articles on the Internet say it's the Capacitors capictors capictors..I checked all of them. My tv just blinked red lights, had the clicking sound at first power on, but then goes black. No sound. No picture. Nothing. Just blinking red lights.
MINE WAS RESISTOR no. 3318 , a 100 OHM RESISTOR ON POWER SUPPLY BOARD.
I BOUGHT REPLACEMENT FOR .99 CENTS SOLDER IT, AND EVERYTHING WORKED!!!
THAT WAS ALL IT TOOK.
JUST A SUGGESTION.. 1. CHECK FOR BULGING CAPACITORS (90 PERCENT OF THE PROBLEM) 2. THEN CHECK FOR RESISTORS WITH MULTIMETER ( FALLS INTO THE OTHER 10 PERCENT OF THE PROBLEM.)
System does not power on and the LEDs on the front of the computer are not flashing. System unable to power on. Press and hold the power button for less than 4 seconds. If the hard drive LED turns green, then: 1.Check that the voltage selector is set to the appropriate voltage. 2.Remove the expansion cards one at a time until the 3.3 V_aux light on the system board turns on. 3.Replace the system board. OR Press and hold the power button for less than 4 seconds. If the hard drive LED does not turn on green then: 1.Check that the unit is plugged into a working AC outlet. 2.Open hood and check that the power button harness is properly connected to the system board. 3.Check that both power supply cables are properly connected to the system board. 4.If the 3.3 V_aux light on the system board is on, then replace the power button harness. 5.If the 3.3 V_aux light on the system board is off, then replace the power supply. 6.Replace the system board.
it all depends on the number of flashes , pause, repeat. Since the problem did not indicate any beeps her is the following info
Power LED blinks RED 2 times, one every second, followed by a
2-second pause. = Processor Thermal Protection Activated
3 blinks 1 second apart = Processor not installed (not an indicator for a bad processor).
4 blinks 1 second apart .= Power Failure (power supply is overloaded)
Other possibilities are: 5 blinks 1 second apart No memory 6 blinks 1 second apart No graphics 7 blinks 1 second apart System board failure (detected prior to video) 8 blinks 1 second apart Invalid ROM