|Possible reasons why your keyboard isn't working.....|
I'm assuming you are NOT using a wireless keyboard.
It's COMMON for corded keyboards to develop broken wires inside the cord, after the computer has been used a lot, or at any time if the cord has been yanked on The smaller the diameter of the cord, the more likely you'll have that problem, sooner.
Try another keyboard with your computer, or try your keyboard with another working computer
A PS/2 connected keyboard must be plugged into the purple PS/2 port on mboards that have two PS/2 ports.
If you're using a gender adapter with a keyboard that has a USB plug on the end of it's cord to adapt it so you can plug it in a PS/2 port, or a gender adapter with a keyboard that has a PS/2 plug on the end of it's cord to adapt it so you can plug it in a USB port, the gender adapter will NOT work with the keyboard UNLESS
- the keyboard is a "combo" model that has the necessary wiring so that it can be used with either one of both types of ports
- the gender adapter is one meant to be used with a "combo" keyboard, usually it's colored purple, NOT a "combo" mouse, usually it's colored light green.
A "combo" keyboard always comes with a gender adapter when it's new. A gender adapter for converting the USB plug on the end of the cord to PS/2 port use will probably work no matter where it came from, but a gender adapter for converting the PS/2 plug on the end of the cord to USB port use has several possible ways it can be wired up internally and it may NOT work unless it came with the same "combo" keyboard model.
Assuming you have it plugged into the PS/2 or USB port properly, the keyboard may NOT work for getting you into the bios Setup, but otherwise it should work if there's nothing else wrong with your computer.
The ATX family mboard always has DC power in some places, even when the computer is NOT running, as long as the power supply is receiving live AC power.
When you unplug or plug in ANYTHING inside the case other than the Cmos battery, you MUST remove the live AC power to the case, otherwise you can damage something.
If you did NOT do that at ALL times, you may have damaged something, including the power supply.
Some mboards have an led on the mboard's surface that lights up when the power supply is supplying DC power to the mboard, even when the computer is NOT running. That led must NOT be lit up when you're fiddling with the connection of anything inside the case.
For that matter, failing power supplies are common in any case.
If the power supply HAS been damaged or is failing, they often partially work, fans and hard drives may spin, leds may come on, yet you may get no video and the mboard will not boot all the way.
In your case, the USB ports and PS/2 ports may NOT work
A damaged or failing power supply can account for ALL of your symptoms if there's nothing else wrong.
If you can borrow a power supply from another working computer that has the same max (output) wattage capacity rating or more, or one that has a rating of at least 300 watts, try connecting that to your system.
If you are getting no video, people who have started a topic on this site often say that have no video when the actual problem is they have no video AFTER the operating system starts to load.
Are you ALWAYS getting video while booting the computer BEFORE the operating system loads, but NO video after the operating system is supposed to load,
- or - are you getting no video at all ?
If you are getting no video at all...............
That has got nothing to do with the Cmos battery.
You should get video while booting at least BEFORE the operating system is supposed to load from the hard drive, or even when there is no hard drive is installed, even when the Cmos battery is not installed, dead, too weak, installed backwards , or it's installed properly but it's not getting a good connection in it's socket.
Your mboard's Intel G33 Express main chipset has integrated video, and your model came with an NVidia video card installed in a PCI-E X16 mboard slot.
In the case of most main chipsets, and probably in the case of your G33 Express main chipset, when you install a video card in a PCI-E slot, if the video card is detected properly and there's nothing wrong with it, the bios automatically DISABLES the onboard video, it stops sharing ram installed in the mboard with the onboard video, and it ignores any settings regarding that in the bios.
Usually there is NO setting in the bios Setup of your mboard that you can change that actually disables the onboard video ! The bios does that automatically when there's a card in the PCI-E X16 (or AGP) slot.
(The only exception I know of - Some recent and fairly recent main chipsets that have onboard video support "Hybrid video" - Intel, NVidia, and AMD all have some of those - both the onboard video and the video on a card installed in a PCI-E X16 mboard slot working at the same time. If the video chipset on the card in the slot is NOT supported by that feature, default bios settings MAY result in you getting NO video from the card in the slot, yet the onboard video port is still producing video. In that case you need to change at least one setting in the bios Setup to get video from the card in the mboard PCI-E X16 slot. The Intel G33 Express main chipset does NOT appear to support Hybrid video - Intel doesn't call it Hybrid xxxx, but AMD and NVidia DO.)
If you have the monitor plugged into a video port for onboard video, there is no video being produced from that port when there is a video card installed in the PCI-E X16 slot.
Do you have the monitor plugged into the video port on a card in a card slot ?
If you have accidental dislodged the video card while you were fiddling around inside the case so that it's not all the way down in it's slot, you may get no video from the video card either.
Make sure that it's all the way down in it's slot.
Did you unplug anything while you were fiddling around inside the case and forget to plug it back in ?
Most mboards require that two power sockets on the mboard have wiring connectors plugged into them that fill the sockets - a main 20 or 24 "pin" socket, and a 4 or 8 "pin" other socket.
Your original video card that was installed in the PCI-E X16 slot MAY have this, or if you have installed a newer video card, some video cards have one or two 6 pin or 8 pin power sockets that MUST have wiring connectors from the power plugged into them that fill the sockets
Did you unplug that (those)and forget to plug it (them) back in ?
Removing the Cmos battery. re-installing it, or moving a jumper on the mboard to clear the Cmos, moving it back, sets the bios to default settings, including the date and time.
(When you do have video....) You get a "Cmos Checksum Error" or similar error message the next time you boot the computer - you must go into the bios Setup and set at least the date and time, save bios settings.
There is a setting in the bios Setup settings for USB Legacy Devices or USB Keyboard or similar that must be enabled there in order for you to be able get into the bios setup with a USB keyboard, but that has NO EFFECT on whether the USB keyboard works for anything else. On newer mboards, that setting is usually set to Enabled by default.
Gateway GM5478 Desktop Computer (home support page)
Chipset Intel G33
Video •NVIDIA® GeForce® 8500GT 256 MB video card
Search for: Intel G33
= G33 Express
Search for: GeForce® 8500GT system requirements
- recommended system minimum power supply capacity 300 watts
(Minimum recommended power supply with +12 Volt current rating of 18 Amps.)