I was brought a box last night, a friend of my dad's friend needed help with their old computer. I agreed. The computer is an old Dell Dimension 4700. Pentium 4 CPU, 508MB RAM running Windows XP, but I believe the issue is hardware related.
I finished cleaning the viruses from the hard drive and such and shutdown the system, I then opened the box to clean out dust buildup which was very heavy. keep in mind the CPU has no fan attached to the heatsink. The fan is on the back of the computer and sucks air in from the back, a green plastic "tunnel" directs the air to the heatsink for cooling. I removed the fan with the "tunnel" and used compressed air to blow out the dust. I then used a vacuum cleaner with the small nozzle attachment to suck the dust out of the area the CPU was at. I then re-attach the fan to the back and plug it back in to it's spot on the motherboard.
I then bring the box into my room, plug in the power cable and VGA cable and press the power button. Now it powers on with all the fans at full speed, does 6 long beeps and then idles. Nothing comes up on the screen. Any idea what the heck happened?
Beep sequence is 1-3-2
Upon further Google-ing, I found the beep sequence was a RAM seating issue, which puzzles me due to the reason I never touched the RAM.