Nothing comes up on monitor

[Vaio123]

When I turn on my computer nothing comes up on my monitor. The monitor is plugged in and connected to the computer, but nothing comes up. The computer is running because the hard drive runs for a little while, then stops, and the fan is still running. I don't know why nothing comes on my monitor.

I have a Packard Bell Platinum 40 computer. I know the monitor is not broken because I turned up the brightness and I hooked up my computer to my new monitor and still nothing comes up.
I need help!

[NeedBiosHelp]

There are two things you can do to fix this. Seeing as how no one else here knows anything about this, I will help you.

First off, you need to open up the case to your computer. The "tower", where the CPU, hard drive, motherboard and all that is. Then you want to find the motherboard. Look at the motherboard and see if you can find anything that says, "Clear CMOS", "Reset CMOS", "delete CMOS Password", or anything along those lines. It should be next to a jumper, use that, then put the case back on and boot up your computer. Make sure the PC is unplugged before you do this. Wait awhile if you just unplugged it so it can cool down. Then go ahead and do that.

Since not all motherboards have that jumper, you may need to remove the internal battery from the motherboard. It should look like a little watch battery. Silver, and circular. It should pop out if you apply gentle pressure. Do not force it, because it may be soldered in. If that is the case, then you need to take it in and have someone do it for you. If not, just take the battery out and wait awhile. Anywhere between ten minutes and two hours (Most people seem to argue about the time in which you should leave it out, so just try a coupel hours.), put it back in. Boot up the PC, and it should work. Remember that you need to reset your bios to it's origonal settings. If you don't already know how to do that, then check your bios manual. It should have come with your computer. If all else fails, try to find someone that does know. Any tech guy at a store should be able to help.

If you did all that, and it still does not boot up, then it's broken. You need to replace the motherboard, and possibly other things.

None the less, you should have it taken in and tell them the story. You want to try and reset your bios before you buy a new motherboard though. So you can save yourself money.

[seer_claw]

Have you tried using a different video card? If you can get a hold of a video card from a friend try that to see if it will make a difference.

Or try the "wiggle" test. When your computer is turned off open the case and wiggle the cards to make sure that they are seated in their respective slots properly.