When I am switching on the computer the intel logo is being shown and then the screen is remaining dark.Could anyone please advise?
Thank you.

biosir

Sounds like a graphics card issue...

After the logo, can you tell if its loading windows? (do you ever hear the startup sounds?)

After the logo is up, start pressing F8, do you get a boot menu?
If so, select safe mode... see what happens

Have you installed anything new lately?

Let us know

You could also be underpowering your PC. I agree with StaticFX, if you put new components in, you could be underpowering. Those prebuilt PC's come with 300 Watt power supplys, and if your putting a 9800 GT GFX card or 1 TB hardrives, you won't be able to boot.

and to expand upon the power supply issue. The graphics card does not draw much power until the windows login screen(in other words the little load bar is almost nothing you will tend to see this with a failing power supply still, and all of your boot prior to it) but once it gets windows fully up and running its too much of a drain on the power supply so the computer shuts off the one non essential component. Your video card. Firstly you don't get your screen back because the PC is afraid that if it repowers the video card that it may loose too much power and crash, losing your data. Which is the reason the card gets turned off, you can still save your data with shortcut commands even though you can't see. This is actually quite an ingenious fail safe. But in order to get the video card back you have to reboot. So from past experience I would say that is his most likely issue, though it could be a bad driver.

now to get more into the video card side to show why else I think the power supply is more likely. Firstly when a video card is going bad it either goes bad all at once or displays other effects such as random discoloration. Not just a black screen when windows boots.

now to explain why I went into all this detail. The advice here is pretty much what I'm saying so why post? Not because either of them are wrong, but because another user who obviously doesn't know what he's talking about wants to discredit someone who was probably on the right track. You should either A know more about the subject before giving kudos or taking them away or B know that the solution isn't helpful because the user tried it. Your not the user that posted the question nor are you that knowledgeable. I'm not trying to be the bad guy here just point out that the user were posting this for could have ignored good advice because you said it was bad advice and it was not. Which does harm to all involved, it makes you look less knowledgeable, a user posting good advice less knowledgeable and the user without a clue who to trust for advice that he(or she) came here for. :)

Try Booting in safe if it goes then it's a driver issue.

Also can try a simple boot disk like ERD Commander, Ultimate Boot Disk.

Press f8 to enter safemode then run scanning software or check is there any beep comes or not if so, it means your hardware have some problem like ram, but if no then would go for installation of windows because your operating system might have correpted.