Sometimes when I turn my laptop on, I hear the computer winding up then it stops. The screen remains blank. Sometimes I have to restart the computer 4 or 5 times before it comes on. And sometimes when it comes on it skips the login screen and goes straight to windows XP, with me having to enter my password. Do you have any idea what might be happening?

overheating issues,

Try Hooking an external monitor to the video output on the back of your computer to see if there is video activity present, if it works then we would suspect the LCD or the inverter board. But if both screens show blank then it could be a hardware issue. I suggest taking it to a computer tech for an estimate if all else fails.

this happen the when the processor inside the laptop has got dust. and the heat is not able to come out of the computer, so kindly use laptop cooler, this will surely solve your problem, thank you.. plz rate me

Can you hear the hard drive spinning and the computer appears to be running but you you get a blank screen. If you look at the LCD screen at an acute angle and you see a dim image. then you have a backlight problem. To determine if you have a video card problem or a lcd screen problem, Connect an external monitor to your laptop and power the monitor up first and then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.
Get back to me with the results of these tests and any error messages etc. so I can advise you.

Try taking out the hard disk, plug in power and see if you have a display on your screen or external monitor. if same thing happen, try taking out the memory card. If you hear a beep sound it's a faulty mem. card, if no beep sound appears I suspected it's a motherboard faulty.

First,If you are running windows vista,This can be due to an update that has your video driver and windows video driver running at the same time.

Hardware would be the invertor board is bad.

Ttry to start with F8 and choose start in vga mode,If this allows you to start normally,go to the device manager and update the video drivers

Sounds like a bad motherboard. Do you hear anything else happening at all?

Maybe not. Find the FN key. It is usually BLUE in color
Then look on TOP row of Computer keyb (or all over) and find CRT/LCD.
Press the FN and that key and your screen should come back. You accidentally sw. it to CRT (outside, external monitor)

when you turn on computer on gently tap F8 then when screen comes on select safe mode let it go ahead and finish loading.Sometimes after you do this and turn it back on it may load up normally. If it don't do same thing and then go to last known good configuration. Try that. Then let me know what happened.
God Bless Greg

Your CD drive is bad or its the videocard gone out at that exact moment you had the CD in.