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Solved Flashing num lock and scroll lock lights

August 22, 2011 at 13:16:17
Specs: Windows XP, pentium 4 2ghz 1.25g

these lights flash inconjuction with a pop down menu resembling a right click on the mouse that did not ocurr. At times the system will navigte backwards as if the back tab were hit when it was not

See More: Flashing num lock and scroll lock lights

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✔ Best Answer
August 23, 2011 at 15:17:57

Manuals
Dell™ Dimension™ 2400 Series
http://support.dell.com/support/edo...

Service manual - view
http://support.dell.com/support/edo...

Service manual - Advanced troubleshooting
http://support.dell.com/support/edo...

There's nothing in there about flashing num lock and scroll lock leds, but there's other info.

......

Your system produces normal error beeps, or diagnostic error patterns of leds, rather than flashing leds on the keyboard to indicate errors.

You could try searching for something such as
Dimension flashing "num lock"
or
Dimension blinking "Num Lock"

Many "hits" are for systems much newer than yours.

Very few if any are for Dimension models.
.......

Have you tried a different keyboard ?
.....

"these lights flash inconjuction with a pop down menu resembling a right click on the mouse that did not ocurr"

What words are on the menu ?
........

My guess would be your power supply is failing.
If the leds flash BEFORE the operating system loads, it probably IS failing.

If you can borrow a power supply to try with your system, try connecting that.
............

Or failing capacitors can cause all sorts of weird symptoms.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:
http://www.halfdone.com/Personal/Jo...
...........

Possible USB device conflict.

If it's a USB keyboard, try unplugging all other USB devices one by one to see if the flashing leds go away.

I've seen this, rarely.

Sometiimes USB devices have a conflict that causes weiird symptoms.

E.g.
I have a certain Logitech combo (PS/2 or USB) laser mouse model that conflicts with a USB device that adapts a radio controlled model airplane transmitter so that it can be used with a flight simulator program on a computer. Whether the radio controlled model airplane transmitter is connected to or not, when both the adapter for the transmitter and that mouse model and are plugged in, one or the other device does not work properly - either the led inside the mouse blinks and it doesn't work, or the transmitter adapter doesn't work. The combo mouse never has a problem when it's connected to a PS/2 port, the transmitter adapter has no problem when any other USB device is plugged in, and that combo mouse doesn't have a problem connected to a USB port when the transmitter adapter is not connected.
( The transmitter adapter draws very little current.)

If it's a USB keyboard, try unplugging all other USB devices one by one to see if the flashing leds go away.



#1
August 23, 2011 at 02:34:42

jdpete, possible you have some sort of nasty and need to scan? Don't forget to scan for Trojans/worms, etc. The 'pop up' makes me think 'nasty'.
If that doesn't do it, maybe 'Uncle Bill' knows?
http://support.microsoft.com/search...
HTH
Ed in Texas

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#2
August 23, 2011 at 11:07:06

Ed Thanks for the response. In fact I have scanned the system with PC Tuneup, Advanced care Pro, Kaspersky, IObit, Norton, AVG and Stopzilla. None of them have fixed the problem.

If anyone knows of a better tool I would appreciate hearing of it.


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#3
August 23, 2011 at 12:18:39

It's extremely unlikely your flashing leds problem is caused by malware.

Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model, or at least the model, of your mboard.

Apparently recent computers may produce no normal single mboard beep when the POST completes successfully, or mboard error beeps - instead the flashing of leds that don't normally flash indicates a mboard or system error.

If that doesn't apply, some mboards have diagnostic routines built in (e.g. ones in Dell computers) and can flash the leds when something is wrong, or I've seen that it's possible for some desktop power supplies to do that if there is a problem with the PS.


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Related Solutions

#4
August 23, 2011 at 13:51:59

Thanks for the response. My computer is a Dell demension 2400 and is about 7 years old. Its equipped with a pentium(R) 4 2.2ghz, 1.25 GB ram.
Running windows xp and service pack 3. I normally have my sound muted, but at times when it is on I get a series of beeps coresponding to the leds flashing and to the unwanted drop down menus
Is that enough info or should I open up the PC to find more data on the motherboard?

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#5
August 23, 2011 at 15:17:57
✔ Best Answer

Manuals
Dell™ Dimension™ 2400 Series
http://support.dell.com/support/edo...

Service manual - view
http://support.dell.com/support/edo...

Service manual - Advanced troubleshooting
http://support.dell.com/support/edo...

There's nothing in there about flashing num lock and scroll lock leds, but there's other info.

......

Your system produces normal error beeps, or diagnostic error patterns of leds, rather than flashing leds on the keyboard to indicate errors.

You could try searching for something such as
Dimension flashing "num lock"
or
Dimension blinking "Num Lock"

Many "hits" are for systems much newer than yours.

Very few if any are for Dimension models.
.......

Have you tried a different keyboard ?
.....

"these lights flash inconjuction with a pop down menu resembling a right click on the mouse that did not ocurr"

What words are on the menu ?
........

My guess would be your power supply is failing.
If the leds flash BEFORE the operating system loads, it probably IS failing.

If you can borrow a power supply to try with your system, try connecting that.
............

Or failing capacitors can cause all sorts of weird symptoms.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:
http://www.halfdone.com/Personal/Jo...
...........

Possible USB device conflict.

If it's a USB keyboard, try unplugging all other USB devices one by one to see if the flashing leds go away.

I've seen this, rarely.

Sometiimes USB devices have a conflict that causes weiird symptoms.

E.g.
I have a certain Logitech combo (PS/2 or USB) laser mouse model that conflicts with a USB device that adapts a radio controlled model airplane transmitter so that it can be used with a flight simulator program on a computer. Whether the radio controlled model airplane transmitter is connected to or not, when both the adapter for the transmitter and that mouse model and are plugged in, one or the other device does not work properly - either the led inside the mouse blinks and it doesn't work, or the transmitter adapter doesn't work. The combo mouse never has a problem when it's connected to a PS/2 port, the transmitter adapter has no problem when any other USB device is plugged in, and that combo mouse doesn't have a problem connected to a USB port when the transmitter adapter is not connected.
( The transmitter adapter draws very little current.)

If it's a USB keyboard, try unplugging all other USB devices one by one to see if the flashing leds go away.


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#6
August 24, 2011 at 11:10:53

Thanks again for your input. I tried searcing as you sugested but I got no hits on either flashing or blinking. I did though search on dell diagnositcs and got this info

http://support.dell.com/support/edo...

Now what puzzles me is that I have all for diagnostic lihts showing yellow, but the table doesn't show a cause for this condition. Any ideas? I guess I should just call Dell

Thnks again


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#7
August 24, 2011 at 11:47:53

Thanks again tubesandwires sorry I missed reading all of your last message but I don't have a USB keyboard but I am using a USB wireless mouse. However; I was having the problem with the origial wired mouse so I changed it thinking that might solve the problem

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#8
August 24, 2011 at 20:22:04

"I did though search on dell diagnositcs and got this info...."

That's exactly the same info as at the third link in response 5.

" I have all for diagnostic lihts showing yellow, but the table doesn't show a cause for this condition."

all four diagnostic lights ?

You can Edit any of your own posts (for a limited amount of time) by clicking on the icon that looks like a notepad at the right top of your posts.

Obviously yellow is bad, green is good.

Did you check the capacitors ?

Have you tried a different keyboard ?

Have you tried unplugging all USB devices ?


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#9
August 25, 2011 at 12:10:38

Thanks tubesandwires.

As you suggested I changed the keyboard to an old microsoft board I had and its been error free for about 4 hours now. I'm pretty sure this has fixed it.

Thaks again


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#10
August 25, 2011 at 17:56:09

Thanks for the thanks.

That's the first time I've heard of a wonky keyboard causing those four diagnostic leds to all be yellow for a mboard in a Dell desktop system.

It's common for the wires inside the cable of corded keyboards and mice to get broken after they have been used a lot, or at any time if the cord has been yanked on , usually near where the cable enters the device, and if the insulation is still intact the connection of the broken wire is intermittent rather than being reliable and that can cause oddball symptoms,
but you didn't mention anything else being wrong with the keyboard.


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#11
October 1, 2011 at 18:50:44

I discovered what was making my Scroll light flash on my own computer. I have installed a program called Pop Peeper that checks my email on 20 accounts every hour. One of the ways that it notifies me of new email is the flashing scroll light. I didn't know of this until one day I was checking through the Tools/Option tab and read the checked box there. So a year long mystery has been solved for me anyways, hope you find your solution as well

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#12
October 1, 2011 at 19:17:03

ricksittel

It's rather unusual for software you have installed to flash an led on a keyboard, but it's certainly possible
It should have been a good clue that you didn't have the flashing led until you had installed that program, but on the other hand you may not have noticed that right away.


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