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Go to www.google.com and type: "Ibm Aptiva Support or Lenovo Support" in the search (without the quotes). Go to their drivers and download site, enter your computer's model and operating system. Look for Manuals or Documents on the site to download.
If you want it to go aheand and boot with the bad keyboard or PS2 socket, go to the BIOS and change the "Halt on All Errors" to not halt on keyboard errors. Otherwise, you need to replace your keyboard and/or make sure it's not your PS2/keyboard socket on your mobo.
chessmaster2 has some good points... you need to make sure your computer is getting power first... a lot of motherboards have a tiny green light that is on when computers are plugged in but off. If you are not sure what a mother board is, then you probably can't do much more than what chessmaster2 gave you. By the way, if this computer is old, the majority of computer problems that you've described are because the power supply is bad. A lot of people don't regularly (2x a year) blow out the dust from their computer. So it collects dusts which then block the ventilation holes, so things overheat and go out, and typically that is the power supply.
the cords etc only fit one way in one place... exploded parts view on computer equipment ? forget it, how do you think us technical guys survive ? :) seriously though, try checking the power delivery from the power cord before it plugs into the transformer, then check if the transformer is delivering power... voltage meter and common sense not to electrocute yourself ( or your dad in this case ) would be wise. further remove the battery and see if it works with the mains plugged in without a battery ( faulty battery perhaps )
Its more than likely the transformer though and these can be purchased at reasonable proces either at a dedicated IBM aftermarket parts supplier, IBM themselves or trawl the net...
You may try connecting a different usb keyboard to your system. Mostly, some keyboard converted from serial connection to a usb could cause this kind of problem. In some cases also, wireless keyboard and mouse won't work when u turned on your system if the driver is not properly install.
You may also try disconnecting any other usb devices from your computer. Disconnect also your power supply then push and hold the power button for 5 seconds. Plug back in the power cord then connect your keyboard. Turn on your computer. if it doesn't work, i suggest to call your computer manufacturer and check your warranty. This could be an issue with the motherboard of your computer.
Check your Keyboard-Video-Mouse (KVM) switch. If the system is connected to a monitor, mouse, and keyboard through a Keyboard-Video-Mouse (KVM) switch, or console selector switch, then disconnect the switch and connect monitor, mouse, and keyboard directly to the system. If this solves the issue, please contact your switch manufacturer for support and compatibility on the switch. Some switches can have a firmware update applied to resolve common problems.
Note: BladeCenter Telco chassis - The KVM module contains keyboard port, mouse port, Power LED, Location LED, Critical Telco Alarm LED, Major Telco Alarm LED, Minor Telco Alarm LED and a video port. The PS2 keyboard and mouse connectors are standard 6-pin Mini Din. The Telco alarms mirror the Telco alarms located on the front panel of the media tray because they use the same signal lines. The KVM module allows the connection of a VGA monitor for system maintenance and control. The video connector is a standard 15-pin VGA. The KVM module is hot-swappable. It is docked into an edge card connector located on the backplane:
If you have your system daisy chained for KVM capabilities using the C2T port (e.g. xSeries 330), then you must flash the C2T firmware after flashing the system BIOS, in order for the mouse and keyboard to work. Otherwise, after a BIOS flash, you will lose keyboard/mouse capabilities unless you walk up to each machine and push the select button.
If you are using NetBAY Advanced Connectivity Technology (ACT) CAT5 cabling in your rack server, instead of KVM cabling, click here for ACT information.
Check for POST/startup errors. If you are getting a POST/startup error on the keyboard and/or mouse:
Verify that all items are firmly connected to the correct ports, and that the cables are undamaged with no bent pins. The PS/2 style mouse and keyboard ports look identical, but are not interchangeable. The mouse and keyboard must be attached to the correct ports in order to be recognized by the system and to function correctly.
Swap each item for known good units. If a new item works where the original did not, then the original component must be faulty.
If the keyboard works during the POST/BIOS screens, but not in the operating system, check software logs for device driver errors. Contact your software vendor for more support in configuring the I/O devices.
Check the F1 Setup error logs for system component failures or errors. These are found under Event/Error Logs. Troubleshoot suspect components further to determine if the hardware is faulty. If an IBM component is determined to be faulty, please contact your local IBM Support Center for warranty replacement of the part(s). Please have the Field Replacement Unit (FRU) / Customer Replacement Unit (CRU) part number and Machine Type, model and serial number ready.
Run hardware diagnostics. Replace any parts found defective.
When you say the pc is working fine, it's hard to tell if there is no visual from the monitor.
Are you getting the 2 usual spaced beeps when your pc boots up, is your keyboard ps2(normal pin type plug or USB)check you have keyboard and mouse in their correct connectors (mouse-green plug, keyboard-purple plug)
I'ts more than likely had a bit of banging about in storage and especially if it's been in a cool area, then placed in your house, there may well be condensation points inside which may take a few days to dry out.
Try your monitor in a friends pc to eliminate that first.