|"the lapto simply just goes to hibernation after logon. it does so for about 4-6 times before it stays 30min after logon and the hibernating by itself."|
Whether Hibernate or Standby mode work properly depends on whether XP has the proper info about how they are supported by your mboard. If you still have the original brand name software installation, or if that has been re-loaded by you doing a full proper Recovery procedure for the model, XP has that proper info.
If you have reloaded only Windows from scratch from a regular XP CD, or if you used only the XP re-installation CD that came with the computer to install Windows, XP may not have the proper info about how they are supported by your mboard, and you need to install the main chipset drivers for the mboard to supply Windows with that info.
Whether your laptop goes into Standby or Hibernate mode depends on settings in Control Panel - Power Options. Standby settings are on the Power Schemes window of that - Hibernate mode is NOT enabled unless you enable that yourself, on the Hibernate window of that - Standby mode is the default .
Windows goes into Standby or Hibernate mode after a set period of time shown there on the Power Schemes window, going by it not detecting user activity for that amount of time - e.g. if you are reading something that doesn't count as user activity.
If XP has the proper info about how your mboard supports Hibernate and Standby modes, getting out of Standby mode merely requires you move the mouse or press a key - getting out of Hibernate mode may require you do something else, depending on your model, such as briefly press the power button.
The built in display having no video, the led for it being in the state it is when there is no video signal, after you first log onto Windows, is NOT normal behavior. Standby and Hibernate modes do NOT do that, unless the user inactivity time has been exceeded.
If you ALWAYS have video while booting before Windows starts to load, and it's only after Windows starts to load that you get no video, it's something about Windows that isn't right.
- most likely - you don't have the main chipset drivers installed. Install them.
If you sometimes get no video while booting BEFORE Windows is supposed to load as well, then the following probably applies.
- your built in display's backlight, or less likely the voltage inverter that supplies it with high voltage, is in the process of failing. That's common and especially likely after the laptop has been used a lot. The symptoms tend to be intermittent before you get no video at all, all the time. OR - the wiring between the video adapter and built in the display has a problem. Usually there's nothing wrong with your video adapter.
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1:
DO NOT plug in or unplug a monitor's video cable into / from a video port while the computer is running. Doing so can damage the monitor's circuits and/or the video adapter's circuits.
Some laptops will display on an external monitor without you having to do anything.
If you get no video on an external monitor, some laptops have a key combo that you must press to toggle the display to external video only / sometimes both / built in display video only - see the Owner's or User's manual for the model.
"in order cases it will boot up to the windows xp desktop, then after some few minutes the screen will start having coloured vertical lines in red blue and then shutdown by itself this is irregular and apperas once in a while"
The colored lines may indicate your video chipset and/or your cpu is overheating, if that does NOT occur until a while after your computer is booted after having had a chance to cool to room temp.
If you get the lines despite the computer being cool, such as right away or very soon after you boot a cooled off computer, the LCD display or the video adapter is damaged.
"My observation is that the fans are not working correctly. How do i fix this problem?"
With some laptops, the fan spins while booting, then it shuts off and doesn't come on after that until some temp has been exceeded inside the case - it goes on and off repeatedly, most of the time it's off.
With other laptops, the fan does not spin while booting, but it does come on intermittently as you use the computer.
You may or may not have noticed what it's normal behavior is - it often doesn't make much noise when it does spin.
If you're sure your fan never comes on now when you use the computer for at least a half hour, yes, there's something wrong with it, and most likely you need to replace it. The fan going on / off has nothing to do with the software on the hard drive, and usually there is no setting for it in the bios either.
If your cpu (processor) overheats beyond a certain temp, the computer's bios will shut down the system, and the computer will NOT start up again after that until the cpu has cooled below some temp.