Forgive me for not being too complex when I talk about my recent computer trouble. I'll try to give as many details as possible, but I'm not too bright when it comes to the terminology. I was recently cleaning in my room and moved my CPU to clean under it. An hour later, I decided to get on my computer and noticed that nothing happened when I moved the mouse. There wasn't a cursor and the screen appeared frozen. I shut the computer off and reset it. I figured that I would just have to reinsert the memory modules, because this has happened before when I've moved my computer. I got the correct number of beeps and deduced that it was the memory modules. I opened up the case and reinstalled the memory modules into the correct memory slot. I then tested the computer and an even bigger problem occurred. The computer acted like it was going to boot up, but then shut down after 3 seconds of attempting to boot. About another two seconds later, the computer acts like it's booting up, but nothing happens. The monitor won't turn on (I've tested it with another monitor and video card). There is a very short and low beep (I think it's the beep for when the hard drive has initiated or something-it doesn't sound like a diagnostic beep) I have a Dell Dimension 4 and they have diagnostic lights on the back. According to the lights, it says that the computer recognizes the memory modules, but there is a problem with them. I'm not sure if this is correct. I bought an air canister and cleaned out the memory slot and the inside of the computer and still get the same problem. If anyone can help, it will be greatly appreciated. School is starting soon and I desperately need my computer to work (but I'm not quite to the point where I want to shell out $300 for a repair guy to fix it).

Well, if the official Dell error message says RAM, start by replacing your RAM. If the computer were on and they were jarred loose while it was powered up, it might have ruined the RAM chip. MCSE, MCSA Messaging, baby!

I Agree. Try one memory module at a time.