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Pc boots up, but shows no signal on monitor. then pc will no shut off

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  • 4,740 Answers

Check all leads to your hard drives and make sure they are a tight fit.if its bleeping on start up then check all leads.
check your vga lead from your tower to your screen.

Posted on Mar 29, 2015

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Posted on Jan 02, 2017

MJS_1
  • 150 Answers

SOURCE: pc starts and runs but

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.

Posted on Jun 26, 2008

sarasvatas
  • 329 Answers

SOURCE: My PC is not booting!!

first try to boot with new ram or try your ram in other cpu to confirm that its due to ram problem or something else......then try to replace your cmos battery or chk it with multimeter whether its working or not then try to change SMPS with new one............

Posted on Sep 29, 2009

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When i plug up the L1975NW lcd monitor what should show up ?


"no input" means that there is no signal from computer or the monitor cable is unplugged. When you first turn on monitor it usually does a self test and then looks for signal. Not connected to PC will give a no signal. If it is connected but PC is off (not unplugged) then it should go into standby as you vid card will be sending a standby signal to any monitor connected. Sometimes the Plug and Play monitors need to register before it will recognize a standby signal from PC, so plug it up and boot up PC. Then shutdown normally, your monitor should go into standby when the PC shuts down.

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Acer x193w Monitor won't come on flashes blue light you see word "Acer" it goes to flashing Yellow light and keeps repeating that.


you disconnect the monitor from PC
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The monitor needs a signal ( source), i.e., DVD, TV, to show a picture. If your monitor shows no signal then either the source is not connected or not functioning. Check the connections from the monitor to the source. Also, check that the source is functioning properly and is receiving power.

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I HAVE BEEN GIVEN A LT 456s MONITOR AND AM TRYING TO HOOK UP TO A GATEWAY COMPUTOR WITH WINDOWS XP- WHEN I TURN IT ON THE GATEWAY WINDOW SHOWS UP AND THE THE WINDOWS XP AFTER THAT IT IS BLANK UNTIL A NO...


I think you are experiencing something that happens a lot when you change monitors, possibly 'downsizing'? Your graphics settings on your actual PC were set too high for the new, smaller flat-screen, so what you'll have to do is hook it back up to another monitor, even an older CRT-style one, and then do the following steps before hooking it back up to your new 14" LCD:
  1. boot into Windows as usual, but on an older, perhaps larger monitor
  2. right-click on any empty area on your desktop, then left-click on 'Properties' at the bottom of the little pull-down menu that pops up
  3. when 'Display Properties' window comes up, click on the very last tab to the right, labelled ''Settings'
  4. find the 'Screen Resolution' slider bar about two-thirds the way down that window, and adjust the slider control to a more standardized, universal setting, like '800x600', or even '1024x786'. Either of those should work with your new LCD flatscreen.
  5. make sure you click 'OK' on that window, then 'Shut Down' Windows properly (using the Start button, and all that)
  6. disconnect your old monitor, and hook your new one back up. It should work!
This happens a lot. I build HTPCs, so it's even worse the more 'options' you have, believe me.
Hope this helps!

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1 Answer

Screen comes on says Acer then No Signal, and goes out. if shut power off and then back on get same result.


This means the monitor believes it's not connected to the computer. Verify the cables first of all. Then try booting in safe mode (F8 key at PC startup) in order to verify that the PC is sending data to the proper video port (you might have a dual VGA / Digital output, for example, and the monitor might be connected to the wrong PC port). Quite often, a "bad signal" will be the same of "no signal"; and you can have a bad signal if the monitor resolution on the PC is set too high. This could happen if you installed a high-resolution capable monitor, and then replaced it with a not-completely-plug-and-play, lower resolution one. The PC would keep sending hi-res signals to a monitor which can neither interpret them, nor tell the PC "please slow down". To check this last possibility, reboot your computer while the monitor is ON. When PCs reboot, they usually drop back to standard VGA signaling, which all monitors understand. If the monitor abruptly comes to life and displays a boot screen, then goes No Signal again after several seconds, you've got a resolution issue; get in Safe Mode with F8 key at boot, and modify the screen properties (right-mouse button on the desktop, then Properties).

If everything else fails, try also connecting the monitor to another PC or laptop, to see if it works there.

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The monitor shuts off. Turning the power off


the monitor is going into power saving mode ... it can happen if it is not receiving any signal from the pc ( pc is not running or booted properly, bad video cable connection monitor to pc) or the pc is itself in suspend/standby mode.

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My Dell Optiplex GX1 will not boot. The Monitor shows no signal.


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Monitor comes up shows "acer" then says no signal and goes black


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