Can anyone who has had a similar problem please let me know roughly how much a repair would cost for the following laptop.
Toshiba Satellite L300D-10Q
It started switching itself off then on again, then we noticed the fan didn't seem to be working so could have been overheating and shuting itself off to prevent serious damage. It now wont even reach post.
I think nobody can say how much a repair for this notebook costs. This is depending on the spare parts and working time from technician. There are some many different spare parts available for each notebook and so nobody can answer this question at the moment. You should speak with a technician. They can check the notebook and give you an estimate for repair.
But before you go to an ASP you should clean the notebook. Maybe the dust is blocking the fan and so it’s overheating and switching itself off. I also clean my notebook. I do this every 4 months and follow these instructions: http://aps2.toshiba-tro.de/kb0/HTD7A01ZZ000AR01.htm
It is not easy to say something about repair costs. I believe costs are country specific and also must not be the same on every service provider.
In my opinion you should contact several ASPs in your country and compare the service and prices.
After doing this you can make decision where to send your notebook.