Weird keyboard problem

PetarBG February 13, 2009 at 08:46:33
Specs: Windows XP SP2
Hello everyone, I`m glad I stumbled across this forum while looking for a solution for my weird problem.

My problems have started a few days ago, when my Logitech G15 Keyboard started acting in a very strange way. I`ll try to describe my problems in the order I had noticed them as well as I can (English is not my first language tho). Also, I`m correcting the numerous errors that my keyboard makes so I make this post as understandable as possible.

1. I can`t type big letters, as if my Shift key isn`t working. When I hold Shift key, nothing happens at all, or I get a small letter in the best case.
2. My Caps Lock key turns on randomly. Pressing the Shift key sometimes triggers the caps lock key too.
3. Even when my caps lock key is working, the led indicator light is blinking in very short intervals - it is not constantly lit.
4. Now, whenever i press shift or caps lock key, it all goes crazy. Sometimes i get big letters when my caps is off, sometimes i get small letters when my caps is on, sometimes its normal.
5. After the problems start occuring, and i try to type something, sometimes i get nothing out, my keyboard "remembers" the letters I`ve pressed and there`s a 5-6 second delay until the letters appear on the screen.
6. When this "remembering" problems occur, the letter order almost always comes out wrong. Since I`m a decently fast typer, this occurs a lot when typing and it makes it unbelievably hard to type anything properly.
7. The keyboard also seems to remember when I held the shift key, so clicking anywhere with my mouse selects the whole text/page.

I`ll now try to demonstrate some of the problems, by letting my keyboard type as it wants to.

(CAPS ON) - CaPS SHOuLD Be ON AN Is DHouLD Be WRITiNG BiG LeTTERS ONLY. HOwEVeR, ITS OBVIOuSLY NOTHe TCASE. (notice how it puts some letters in random order, although I`m certain I typed them correctly.
(caps off) - yektfihsgnidloh (tried to type "holding shift key" while holding it, and this came out).
(caps on) - now the caps lOck key turned on by iteslef. nicEto tHeSe randOm big letters (the word niceto shoUlD havE went out as notice).

Now, the worst part... I thought the problem was in my G15 keyboard (connected via USB), and I connected my old Logitech Deluxe Keyboard via PS/2 port, and the problems are the same. I`m using Windows XP SP2.

I really don`t have any idea what this is about, as I`ve never seen anything similar. Hopefully I managed to explain this so you could understand it. I`m hoping that anyone of you will have some sort of solution.

Note: I needed around 35 minutes to make this post look properly and readable.

Best regards and thank you in advance,

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February 13, 2009 at 13:55:12
"I connected my old Logitech Deluxe Keyboard ia PS/2 port, and the problems are the same"

Test system with live linux cd.

"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10

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February 13, 2009 at 13:59:28
"Now, the worst part... I thought the problem was in my G15 keyboard (connected via USB), and I connected my old Logitech Deluxe Keyboard via PS/2 port, and the problems are the same. I`m using Windows XP SP2."

If you had not mentioned that, I would have suggested the following as the most likely thing, but I will mention it anyway, because it COULD apply to both to BOTH keyboards - if you have another keyboard aswell you can try, try that too.

Apparently your G15 is a corded keyboard, and I'm assumimg your PS/2 connected one is too.

It is very common for wires to get broken inside the cable for a keyboard (or a mouse) after it has been used a lot, or if the cord has EVER been yanked on, or if it was frequently unplugged by pulling on the cord rather than the connector on the end of the cord. Often the wires are broken inside the cable right where it enters the keyboard (or the mouse) - if you re-position or wiggle the cord there, or next to the connector that plugs into your computer, you MAY see the weird symptoms will come and go. If the broken wire ends are still touching each other within the intact insulation of the wire, the device still works but the connection of that wire is intermittant rather than being reliable, so sometimes the device will behave weirdly - sometimes it's as if some malware is controlling it.

If you DO have that problem, the keyboard will NOT work properly connected to ANY computer, at least some of the time.

There is no cure for that, other than you chopping off the cord before where the wires are broken and re-wiring it to the keyboard (or mouse) inside the device, or re-wiring it at the other end of the cord, and even then the keyboard circuits may already be damaged.
or you use a properly working keyboard.

Try BOTH keyboards connected to another computer - you may need to install software for the G15 BEFORE you first plug it in.

If they BOTH work fine connected to another computer, your computer mboard is probably damaged and you need to replace it!

Try yet another keyboard with your computer if you can.

How could it have gotten damaged?
- a power spike or surge, often experienced during a power failure event
- a nearby lightning strike, or a nearby lightning strike on your AC power grid
- a static electricity discharge - DO NOT use a vaccuum cleaner to clean your computer - they produce a tremendous amount of static electricity! - if the computer is in a location with synthetic carpet and low relative humidity, it could have gotten a discharge from that source
- for a desktop computer, damaged caused during the failure of a computer power supply that you have since replaced, or by a ps presently in the process of failing

Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:

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March 22, 2009 at 16:16:11
This is interesting because I continue to experience this same
problem on my laptop. The other problem that accompanies
this situation is when i click any where in the document the
entire document becomes blocked as if I was about the do a
cut and paste. I have not found the solution the latter part of
this problem but as far as the caps is concerned I typically hit
my function key simultaneously with the shift button on the
right hand side of my keyboard. It appears that something
may be getting stuck internally with the shift button on the left
hand side. This seams to work for me each time. Any other

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March 22, 2009 at 19:27:38
Donna B

If you are using a corded mouse, the same thing can happen with that cord as for the keyboard cords in response 2 - the mouse may do bizzare things.

If you're talking of the laptop's keyboard, can you try a USB connected keyboard? If the USB one works fine, laptop keyboards are a frequently replaced item and relatively cheap.

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