SYSTEM FAN SPEED:
Thats if you have a system fan installed, i.e one plugged into the motherboard to measure RPM/temp. You probably do have system fans, but they are probably recieving power from the Power Supply, and not from the motherboard, so no readings will arise.
It has nothing to do with your CPU fan speed, which says is running at 2500 (standard)
Before going any further, were you sure to check the compatability of the CPU and RAM on the motherboard?
ARE YOU RUNNING WINDOWS XP?:
If so, it may be a case of having to format the drive so Windows recognises the new components (you will lose everything on the drive). Windows XP doesn't like large changes to be made, and so may not boot.
The CD may not be booting up due to the fact it isn't set to boot before the hard drive.
DO THIS TO CHECK BOOT PRIORITY:
Press DEL at bootup to enter the BIOS settings,
In one of the menus (not sure which I'm afraid), you'll find boot priority settings, like this:
Secondary: Hard drive
Third: CD Rom,
What you need to do, is set the Primary to possibly floppy, CD Rom as the secondary, and then the third as the Hard Drive.
That way, the disc will boot up before anything else happens to stop it.
Go back in the BIOS after changing this, and go to Save and Exit. You might have to press Y and then enter again to confirm changes.
You shouldn't have to place any more on by the way, if it came like that.
It may be a much faster processor, with more heat output, and in that case, if you can, remove the side of the case to test if temps go down.
If they do (which they might), you'll have to buy a system fan if none are already in there.
A second option would be to buy a better CPU fan, and depending on case size, there are many soloutions you can try that'll move more air, thus lowering temps, since pre-made cases don't tend to be the most roomiest, or the coolest of places.
I hope this helps