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I see that you have a "z" light indicator on the system when powered ON but you see no video on the screen.
The "z" Indicator means that the system is turned ON and ready to use but is in standby mode.
To disable standby mode on your system simply press the FN button for about 5 seconds on the system make sure that the machine is turned ON, this will make you system go back to normal mode.
For additional info on the issue the system can be put to standby mode by holding down the FN+F4 for a second or two this will enable standby mode on your Thinpad T400 and to disable the standbymode press and hold down FN for 5 seconds.
I hope that this will be of help regarding you concern, have a nice day.
If your system is stuck on the Windows Loading Screen you can try to boot using Safe Mode by restarting the computer and tapping F8 while it is booting. When it successfully load the Operating system you can disable some startups on the machine. Click on Start then click on RUN, type MSCONFIG on the dialog box located on the lower left of your screen. Then Click on the SERVICES tab. Put a tick on Hide All Microsoft Services then click on Disable All button. Restart the computer see if it will works. If not then you need to Reinstall the Operating System to your machine.
Try pressing the <Ctrl> + <Alt> + <Del> keys together. If that doesn't work then the Asus Eee PC 900 user manual has this information: Click 'Instant Shutdown' and select an action from the dialog box. You can activate the task manager, put the system in standby, restart or shut down the system.
If it is so equiped like Dell and HP there might be a built in system recovery try useing the f-key f8-f11 by restartting it and press f8 rappidly till it beeps at you the first option will be to repare pc, if so click on it then click on recover to manufature settings. I don't know if this computer has this option or not but I hope this helps.
How many days you working in you laptop befor coming the blue screen? -- many days, 2 days. or 3 days, then comes blue screen?..
if the blue screen come few days working.. 1) check the programs anti virus.. maybe infected of virus or programs adware.. if yo always connected to the internet posseble happen this case.. or maybe you insert somthing in your system.. like usb flash, mmc. or any device.. be carefall sometime the computer making blue screen if some system error. even you didn't see error before... 2. try make restore system if can.. just go to Start, program., accessories, system tools then, system restor..