My son managed to post a small CD ROM into the CPU tonight, the PC works fine, but can't help but think it shouldn't stay there, any thoughts (other than don't let 4 year olds play with computers!!!)
When you say CPU I take it you mean the big box bit? (the CPU itself is a lot smaller than a CD).
Has he just shoved it in through an air vent or has he stuck it into something like the floppy drive? (you did say small CD) If he's just shoved it in the case undo the screws take the top/side off and remove it, it could be blocking air vents or interfering with the fan or some otherway disrupting airflow. If it is there's a fair chance it'll overheat the processor and cost you money.
Don't be scared of opening the case just leave the plug in the wall but with the switch off and always keep hold of a metal part of the case to keep it earthed (99% of the time it's not necessary but the 1 time you didn't you'd probably cause a static discharge & melt the processor).
PS I built my daughter her own PC before her 1st birthday - there's no way she's getting her hands on mine! I reckon an old P120 will keep her going up to about 3 or 4 yrs old & it only cost me a soundcard after I'd rummaged through my stock of old bits. Worth every penny!
thanks so much for that, i will give it a go, it actually went into, over and above the place where you should put CD's! it's a small rectangular CD, so to be fair can see how he did it - will attempt it in tomorrow!!