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No video signal on computer start up?

Power supply went bad, Replaced power supply but no signal to LCD Monitor. supect Bias Rom deleted or Mother Board damage by power supply failer but not sure. Any advise would be welcome.
This is 2005 built from scatch using a Mother board with AGP and three PCI slots. Graphics built into Mother board.

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  • Ben Wabnick
    Ben Wabnick May 11, 2010

    Do you get any beeps when you turn on the computer.

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If u have built in VGA take off the Rams wash them with some ethanol then dry them with a blow drier then put them back into place and if u dant have built in VGA wash it as well

Posted on Jun 22, 2009

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My wife went to work on the computer- then screen would not turn on. The power light was yellow. We unplugged and replugged in the monitor with no help. I finally did a hard reset of the PC and the monitor...


Yoy see the yellow power light because it is not seeing the video signal from your PC's video card, so that can be the possible cause since you reboot the computer and you get the signal back. Your computer may need to be looked at, try reseating the video card if it is not integrated into the mother board, reset the RAM, check to see if it has any caps with bulging tops in the mother board.

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The power light is flashing green can indicate start/restart of the power supply due to shorts circuits or failing power supply due to bad caps, look for bad caps with bulging top first, see example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums
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Hello there:
This normally means that the cable that goes to the computer from the monitor is not getting any signal from the video card
This is due to a couple of possible problems
the graphics card is not compatible with the monitor
Or the graphics card is faulty or dirty and needs to be removed and cleaned with rubbing alcohol and than reinstalled
I would first try this on a different computer to see if the monitor now works if so han you know you have a graphis card problem but if it does not work than you know that the monitor is the one with the problem
It may have a faulty controle circuit on it and needs to be serviced or jut simply replaced ok
If you do take the video card out of the computer Unplug the power supply to the computer than remove the power supply cord to the mother board and press in on the power button for 1 minute this will release any esd (electrical static dicharge) that is built up during operation than attach it back on the mother board and continue to remove the graphics card and make the replace ment or repairs needed ok
I hope this is very helpful for you
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I have a Gateway w340ua the other day i shut it down properly and todat it will not boot up at all nothing on screen but the dvd rom light comes on ?


Attach a external monitor and reboot -- if it comes up then the LCD on the laptop may be broken / damaged. This is where I would start.

let me know what happens after that.

if still no picture it could mean a bad video card and might need replaced.

Looks like a bad video card/chip or motherboard.

Experts only!!!
Try this:
  1. Power OFF the computer
  2. Remove the battery
  3. Unplug AC
  4. Remove the RAM
  5. Remove the CMOS battery
  6. Press and hold Power ON button for 30 secs. at least
  7. Put back the RAM and the CMOS battery
  8. Put back the battery
  9. Plug back AC
  10. Power ON as normal

If that does not help, remove the hard drive and just boot into BIOS setup.




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No signal on monitor


Do you have another monitor to test your computer? Looks like a surge went into the computer display and damaged the video card.

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EMachine T3406 wont boot


is there a post beep when the pc is switched on. check the memory if it is a beep beep beep sound , also disconect the hard drive, dvd drive, floppy, and any usb devices and see if it boots up. if that fails it does seem like the mother board, also check the cpu fan has it stoped. also find out the power switch conector on the mother board, from the base unit switch to the mother board. also chech the power connector from the power supply to the mother board , on newer boards there are two that go to the mother board its self , a big one and a very small one .

Jul 05, 2008 | E-Machines eMachines Desktop PC

1 Answer

Pc starts and runs but wont boot up monitor shows no signal


1) When you turn on the computer, watch and listen for:

a) power supply fan, (power is on)
b) chassis lights (power is on)
c) ticking sound during memory test
(the BIOS POST is running)

d) beeps or rhythmical error codes
(POST failed, bad CPU, CHIP set, memory or video)

e) Monitor either comes on, displays garbled video,
displays a No Sync or No Signal message...

No depending on how far it gets:

Check power supply, cables etc.
Check video cable.
Check monitor with a different PC

Now unplug the power cord, with the computer still
on, this will help drain any internal capacitors.
Wait 5 minutes, then shut off the switches,
and open up the box. try the following,
one at a time:

2) Remove all I/O cards except the video card,
and don't plug them back in until the problem
is fixed. Unplug all the ribbon cables from
the mother board as well:

Hard drives, CD drive, floppies etc.

Make sure you make notes about how to plug it
back in, and cable orientation !!!

0) Re-seat all power cables: Red, Black Yellow harnesses.

1) Unplug and re-seat the video card

2) Similarly, re-seat all memory SIM/DIM modules,

3) Re-seat the CPU

4) Replace the video card

5) Replace memory, CPU or whole mother board,

Plug the good parts back in one at a time,
and test the machine.

Save for the power supply, there really is NO way to test
and isolate a bad module except by swapping/ trial and error
because of inter-dependencies.

For example a bad I/O card, any I/O card, can short circuit
the I/O bus, causing all other plug-in cards to stop working,
or even the main mother-board to freeze during the POST.

A bad power supply ditto.

A bad memory chip ... ditto.

The type of electronic instruments required to actually
test modern computers running at Gigahertz speed cost
hundreds of thousands of dollars, some cost millions, and
are only available to hi end manufacturers

Even the power supply will not power up for a voltage check
if the mother board is bad, although you can use a jumper
on the green wire to ground to force it on, when you unplug
the power connector from the mother-board, if you are brave.

Computer shops carry a lot of spare parts, and their service
department has gutted computers rigged up as test jigs.

They trouble shoot your system by either plugging your
stuff into their jigs, one at a time, or by plugging known
good components into your computer until the problem
is fixed.

This if of course possibly dangerous, since one bad part
can also fry other good parts that plug into it, or that it
plugs into. The compute shops, of course charge you
enough to make up for this.

If a computer is partially operable, it is also possible to
run software diagnostics.

If not, swap and pray is the only way.

Hope this helps

Please rate my answers, martin.

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First I would double check all of your connections. Then I would try to seat and reseat the video card. If its possible try and use a different video card to test and see if that is the issue. There is a chance that you damaged the mother board during your power supply replacement. Dunno if that helps but thats what I would try first.

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