I was playing on our pc, just had a few internet explorer windows open when the computer freezes. I wait five for so minutes, tried crl alt delete, nothing. Couldn't even get the crl alt delete menu up. So I manually restart the computer.

Now the computer turns on and there is just a black screen with a blinking cursor. The keyboard doesn't light up, nor does the mouse. It doesn't even have any of the writing the comes up before windows loads. We are running windows 7.

Can anyone help???

Urgh - sounds like your hard drive might have crashed. Does it make any beeping noises or anything? I don't think this is something EB help is going to fix, I think you're going to have to take it to a computer technician.

When that happened to me, the motherboard had fried... I hope there is an easy fix for you!

Sounds a bit dire.

When you restart it, do you see a Bios screen come up? Depending on quite a lot of factors, this bios screen could look like anything, but it will generally be the Motherboard manufacturer with some form of detail on how to get into the bios. This will then be followed by a whole bunch of text, which you have mentioned doesn't appear.

I would pull the power out of the back completely, leave it for two minutes, put it back in and restart it. Let us know exactly what you see on screen (if anything) so we know what point it hangs.

If you see absolutely nothing until a blinking cursor appears, you have a bigger problem than you are going to find help on here for, and that computer is going to have to be given to someone who knows what they are doing, because that will point towards hardware issues.

edit

as Zesty said, yes this sounds like a motherboard failure. However, that can also be caused by a power supply playing up.

Most other faults you would still see a bios start screen, short of a video card failure.

When you start up your PC, there should be a number of beeps, long or short. Depending on the number/type, it indicates the error type. I've had beeps for failed ram, failed HD, dead CPU, dead videocard at various times.

ETA: beep meanings here: http://www.computerhope.com/beep.htm

This happened to me also and I was scared the hard drive or motherboard had died, however it was simply that the Windows operating system had failed. All I needed to do was to reinstall Windows and it was fine. However in order to find this out I took my PC back to the shop where I bought it and they diagnosed the problem for me for $60. Once I knew what was wrong my brother was able to reload windows for me (the shop would have charged me to do this).
Good luck.