A305 S6898 power light comes on, computer fails to start up.

A305 s6898. Windows vista.
Over the past several months, I've gone to turn on my computer, and found that the hard drive would simply refuse to spin. I press the power button, and power comes on. The power button glows, and the indicator at the front of the computer is lit to show that the computer has power.
However, the screen does not light up, and the laptop will not boot. The tiny cylindrical indicator that typically flashes when the computer is working properly initially begins to glow, and then stops. It does not start again, and apart from the power indicator being lit, the computer is, for all intents and purposes, off.
The first few times this happened, I ignored it because the computer will eventually turn on after several hard shut shutdowns. The number of attempts has varied greatly depending on the occasion.
It has been happening more and more often.
Due to the fact that this issue is intermittent, and is not accompanied by an errors. I am convinced that this is due to a physical problem within the computer. Possibly a loose connection or an old wire? I'd like to know if it's fixable and, if it is, how to safely go about fixing it. 
thanks in advance

Dear Erico
Thanks for quick response.
I have tried both your proposed options;
Firstly disconnected HD (both power cable and SATA cable) no difference,
Cleared CMOS, no difference.
Checked again seating of memory found OK.
Removed an additional Network Card from the PCI connector, no difference.
Removed connections to CD Rom, (both power cable and SATA) no difference.
Removed for sake of completeness battery, no difference.
The start up sequence apperas quite unusual:
Upon switching on by the power button, the powerlight switches on (green) and the HD light switches on for a short moment (Only while pushing the power button)
Ventilators start running on normal speed.
Access to CD rom (trying to read from CD rom) (also with a start-up disk the computer will not boot)
HD appears to rev up (I only hear the sound of revving up, however no read or write indication (HD led stays dark))
Computer shuts down automatic after about 5 seconds. (ventilators stop, power led switches off)
Computer powers up again automatically after a delay of about 2 seconds.
Same starting up sequence as above.
After about ten seconds ventilators of powersupply and chassis speeds up to maximum revs.
I am not sure if the ventilator of the processor also revs up, I tried same with the processor ventilator disconnected, no difference.
This continuous untill shutting down by hand (pressing power button 4 seconds)
While pressing the powerbutton the HD led lights up.
(power led lights continuously during start up, no POST warnings, no beeps, no cursor on screen)
It appears to me that the computer thinks that it is overheated and accordingly wants to cool down the chassis by additional ventilation. However I anticipated that only the processor temperature is monitored.
The problem first occurred after switching on at 08:00 in the morning after being switched off the day before at 17:00.
your further suggestions are appreciated.
Regards

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