Mini Mac, no light, and roaring fan!

Hi chaps please could you advise on my mini mac prob,
Basically unit was completely switched off for a couple of days, when switched on it booted up to a white screen with the apple logo and spinning timer which kept locking up.
I did a PMU which got me functioning properly (seems to be) but has left me with no indicator light and the fan keeps roaring away at an exaggerated speed.
thx for your time( I have rebooted/restated/shutdown several times but no different
cheers jeff, wales uk

click on the  icon in the left upper menu bar. select +about this Mac+. click on +more info+. copy and paste this information in your next post:
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B07
SMC Version (system): 1.16f11
let's see what you baby is made of before we continue
JGG

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