Remove the RAM and start it.

Does it beep?

I have merged these threads as they appear to be the same issue.

If it is under warranty and you do not want to open it up then call Dell.

is not that i cant open it its that if i do open it i might destroy the sticker inside and lose the insurance

That's bull! Do not let any body tell you you cannot open your computer case. It is your case. Those stickers mean nothing. I showed you the instructions - from your manual. They would not be in the manual if not allowed.

It is YOUR responsibility to keep the interior clean of dust and dirt. You have to open the case to do that.

You have the right to add RAM. You have to open the case to do that.

You have the right to add another hard drive. You have to open the case to do that.

Note that if your hardware fails because you failed to clean the interior free of heat trapping dust, warranty will NOT cover it.

ok thanks i appreciate it yea it does beep and the mother board is green i brought in a friend that knows more about this than i do and he said that in reality theres nothing wrong with my pc but he doesn't know why it isnt working every component (rams, ups, hard drive, fan and the processor) are all working fine but yet we cant figure out why it wont boot so i finally decided am taking it to a technician to fix i am truly grateful for all your help and i thank you for helping me

No problem. Just make sure you take the necessary precautions. Always shut down Windows, power off the PC, and UNPLUG the computer before doing maintenance. Then make sure you touch bare metal of the case before reaching in to discharge any static buildup in your body.

when my screen didnt work i took all my hardware out and got the dust of it and then put it back together and it worked

That's great! Thanks for the follow-up.