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Computer dosent turn on..screen is blank with blinking LED

Hello, i recently was testing a voltage regulator power supply i had built with software running on my computer throught the parallel port. The software tests if the LEDs on my power supply would light up according to the voltages (12v,3v,5v,..) I was moving the board around because some seemed to be lighting while i was doing it. Then a big spark came out of the curcuit board and my computer breifly stoped ( no power, no screen, no nothing) for about 5 seconds. It then came back on how it was originaly. When i tried typing the keyboard didnt work but the mouse did. So i rebooted the computer pressing the reset button. When i try to turn on the computer the power button dosent work only the reset button works. It only comes on when i switch the power switch at the back and the screen turns on but its just black with a blinking light like its on standby.
I tryed to give as much info as possible
Please Help Me!!

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Have u tryed
unplug all of your plugs at the back like blow on them like i do to get lil partcals of dust out then plug all back in and mite work or maybee ur power cord is screwed a bit and u mite have to get a new one whats happednd to ur comp happend exactly the same with mine and i screwed with myn for ages and it finaly worked so maybee just try all that n then if that dosent work as drliativ hes a good guy and will help

hes helped me out a few times hes a great guy

Posted on Dec 02, 2008

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Posted on Jan 02, 2017

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Have a sony tritron wega flat screen tv and it wont turn on, its red light blinks three times, what is the problem and how do i fix it?


Hello
Your TVs horizontal output stage is not working. That means, the line output side [LOT and related components], are inoperative. It may be due to some secondary missing voltages from the power supply section of your TV. There may be some open resistor, or short inside the Line Output Transformer [LOT] itself. Anyway that side is not working. Your TVs power supply regulator system has no trouble. It supplies the required voltage to the other sections. That is why you see the LED [Light Emitting Diode], fitted in front panel of your tv blinking for some time and shuts off. As soon as the TV is switched on, the power regulator system inside the tv will supply all the necessary secondary voltages to all sides. If at any section misses the required voltage, the system control Ic will detect it, and will try to rectify that. It is so programmed at the factory. If it can't do it, it will automatically shuts all the supplies from the power regulator system. It is a protection added by sony to all models of their Tvs.
You yourself cannot detect and repair this fault. Get the service of an experienced technician.

Oct 17, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

My computer went blank when turning it on


1) Computer isn't working, due to the Processor isn't working, due to a bad Power Supply.
Weak voltage power rail.

Enough power perhaps to light LED lights, and maybe spin fans, but not enough power to turn the Processor on.

Computer Power Supply's are rated in Wattage.
Volts times Amperes = Watts.
(Average computer power supply in a fairly new computer, is rated at around 300 Watts)

A) ALL of the LED lights combined, use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts.
C) A typical Processor may use 51 to 125 Watts.
Depends on what Processor it is.

Power Supply with a weak voltage power rail, can have enough power to light LED lights, spin fans, but not enough to turn the Processor on.

Solution?
Test the voltages of the Power Supply,

Or, use a KNOWN to be good Power Supply, that has the correct amount of power cables, the right kind of power cables, the correct size, and shape of the case, and enough Wattage, for a test unit..

A bad Power Supply is one of the leading causes of computer failure.

Sep 19, 2010 | Computers & Internet

1 Answer

The monitor led is green but it gives white flash and still blank


Check the volatage regulator in the mainboard resolder all you found dried unsolder parts inside mainboard. Voltage test the regulator IC if have a voltage flow 2.5 to 5v DC. check ribbon cable connector from mainboard to controller board if properly connected. In the controller board find the small fuse test it for open.
Reminder:
When you voltage test in the power board
in the primary section of power supply
use hot ground. Do not use the hot ground
when you voltage testing the secondary
power supply, mainboard and controller
because it will cause of damage
semiconductor. For safety use cold ground
for secondary, mainboard and controller
board.

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2 Answers

Computer won't start up


sounds like the cpu is dead, if your fan was full of dust theres a high chance it wasnt working properly for a while which would of caused the cpu to fry from lack of proper cooling and also the dust in the vents would have prevented heat from escapeing so its highly probable that the cpu is dead try replaceing it, i cannot gaurentee that anything else internally got fried from the heat tho, i had a similar problem a week ago

May 03, 2009 | Computers & Internet

1 Answer

Won't boot


1. STEP: Ensure Correct Power Button Is Used and Is Not Sticking or Broken. If the power button remains depressed during the power-on attempt, the computer immediately powers off, mimicking a "no power" symptom. Ensure the button is not being held down too long or binding against the bezel or chassis. If necessary, remove the front cover to press the button directly.
2. or else...STEP: Check the Power Button LED on the Front of the Computer (on Blinking yellow)
Initial state of LED at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the hard drive LED is off, it is probable that the power supply needs to be replaced.
If the hard drive LED is on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic LEDs for further information. or lese..

3. STEP: Restart the Computer Using the Power Button.Press and hold the power button down until the computer powers off. This should not require more than 10 - 15 seconds.Press the power button to turn on the computer.
4. STEP: Verify the Power Supply Voltage Selector Is Correct for the Region. Verify the setting for the power supply:
*Unplug the power cable from the back of the system. *Press and hold the power button for at least 5 seconds to discharge remaining power.*Inspect the voltage selector setting on the back of the machine (Figure 1). Ensure that the voltage select is set in the correct position for the region the in which the system is operating: For Europe and Asia, the voltage setting should be 230V.In North America, Mexico, parts of Central and South America, and parts of the Caribbean, the voltage setting should be 115V.*Plug the power cord back into the back of the system.*Turn on the power.
STEP: Try a Different Known-Good Wall Outlet.
STEP: Remove All External Devices. Turn the system off.
Unplug everything from the front and back of the system except for the power cord or AC adapter, including: keyboard mouse monitor speakers printers scanners USB devices handheld PDAs external Zip or CD-R drives joysticks/game pads, etc
Attempt to turn the system on.
STEP: Check the Power Button LED on the Front of the Computer

Blinking Amber/yellow: Initial state of LED at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the hard drive LED is off, it is probable that the power supply needs to be replaced.
If the hard drive LED is on, it is probable that an onboard regulator or VRM has failed.

Apr 26, 2009 | Computers & Internet

1 Answer

Desk top


No Power, No POST, No Video
1. STEP: Ensure Correct Power Button Is Used and Is Not Sticking or Broken. If the power button remains depressed during the power-on attempt, the computer immediately powers off, mimicking a "no power" symptom. Ensure the button is not being held down too long or binding against the bezel or chassis. If necessary, remove the front cover to press the button directly.
2. or else...STEP: Check the Power Button LED on the Front of the Computer (on Blinking yellow)
Initial state of LED at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the hard drive LED is off, it is probable that the power supply needs to be replaced.
If the hard drive LED is on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic LEDs for further information. or lese..

3. STEP: Restart the Computer Using the Power Button.Press and hold the power button down until the computer powers off. This should not require more than 10 - 15 seconds.Press the power button to turn on the computer.
4. STEP: Verify the Power Supply Voltage Selector Is Correct for the Region. Verify the setting for the power supply:
*Unplug the power cable from the back of the system. *Press and hold the power button for at least 5 seconds to discharge remaining power.*Inspect the voltage selector setting on the back of the machine (Figure 1). Ensure that the voltage select is set in the correct position for the region the in which the system is operating: For Europe and Asia, the voltage setting should be 230V.In North America, Mexico, parts of Central and South America, and parts of the Caribbean, the voltage setting should be 115V.*Plug the power cord back into the back of the system.*Turn on the power.
STEP: Try a Different Known-Good Wall Outlet.
STEP: Remove All External Devices. Turn the system off.
Unplug everything from the front and back of the system except for the power cord or AC adapter, including: keyboard mouse monitor speakers printers scanners USB devices handheld PDAs external Zip or CD-R drives joysticks/game pads, etc
Attempt to turn the system on.
STEP: Check the Power Button LED on the Front of the Computer

Blinking Amber/yellow: Initial state of LED at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the hard drive LED is off, it is probable that the power supply needs to be replaced.
If the hard drive LED is on, it is probable that an onboard regulator or VRM has failed.

Apr 05, 2009 | Dell Dimension 8400 Desktop P4 630 3G 1GB...

2 Answers

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Hi..there,
You've got a busted backlight inverter... Need to replaced a new one...

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1 Answer

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1 Answer

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If the blinking amber LED is on the computer itself and not the monitor, this is most likely a power supply issue. First thing to try would be replace the power supply. If the blinking led is on the monitor, it probably has bad capacitors and needs to be replaced. (or repaired)

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1 Answer

Blank scren, led stays green for only one second


Explicit enough to see that's this a a repair shop job. That also probably means a replacement- cost of which will not be much more than repair prices. One thing how ever- the power supply[which would appear to be the problem] is this built into the screen [that is does the screen have mains power direct? Or is it powered from an external 'Power Brick' If it is of the Power Brick type - then a new power supply is the answer - get on of the stabilized universal type with a fistful of connectors and a voltage selector switch.

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