I have the strangest problem I have ever faced and I can't figure out what's going on. It started today after a few hours of full shut down. It had occurred once a few weeks ago, but I can't remember what I did to solve it (I think it went away after some time.)
My laptop's BIOS is continuously pressing some key. I can't figure out which key but all I know it's most likely some alphanumeric key. So far the only text fields I could actually get access to are password fields (asking for Windows password). I can't type the password because it gets filled with this keypress and it's real fast. I have tried to use FilterKeys (I can turn it on through the login screen's accessibility button) - it slows down the continuous stream of keypresses, but it's not slow enough for me to put my password in.
I am sure this is not a Windows problem because the whole computer is down to a crawl right from the moment I flip the power switch. Even in the BIOS setup screen I'm finding it doesn't respond to keypresses half the time, and I have to hold keys down to get the BIOS to respond to them. Also, wherever there is a mouse pointer, I can use both internal trackball and external wireless mouse (Logitech proprietary) to control it without any problem.
The other thing I noticed is that sometimes I have to press the Bluetooth switch a couple of times to get the BIOS to pass the baton to Windows when booting. The switch is always turned on when the BIOS boots, but once turned off it cannot be turned on again. Also BIOS appears stuck until I press the Bluetooth switch, upon which Windows starts to load (or show startup options).
I don't even know where to start with this. Here are things I have tried:
- Remove/reseat/try different configurations of the two RAM cards I have (2 x 1GB).
- Remove wireless module.
- Remove/reseat internal hard disk.
- Remove/reseat internal keyboard hardware. Even with the keyboard hardware removed the keypress is still happening. When connected the internal keyboard fails to respond completely (including Caps Lock).
- Remove all power sources (AC and battery) for 5 to 10 minutes. The computer is stuck pressing the key and removing power doesn't seem to help unstuck it.
- Use an external wired keyboard. It partially works - the keyboard buffer is still being filled with the continuous keypress but at least I can send my own keypresses (like Tab and Caps Lock, arrow keys etc.) to the system and get it to respond some of the time.
- Actually the external wired keyboard works completely, but its signals are usually getting drowned out by those from the internal that is stuck. Sometimes the computer gets the signals but other times I have to compete with the internal and overcome the drown-out by hitting the keys several times or holding them.
- I got to the BIOS setup screen by using the external keyboard. I couldn't do it at all with the internal keyboard.
- Using safe mode - I can't get past the password stage. The loading up of drivers is also incredibly slow (I know from past experience Windows does it fast) but eventually it will get to the password prompt.
I'm gonna have to rip my whole laptop apart and try removing the CMOS battery. I have ripped the laptop apart before but it's very time-consuming hence I want to find some other solution first. I don't know if removing the battery will help.
This laptop is quite old now (think 2006) but I have gone lengths to repair it myself and save it several times from imminent death (so to speak). I'm hoping to save it one last time as I'm not in the right situation to go out and buy a brand new laptop. But I'm guessing I have to do that, sadly.