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Laptop fans and heat-sinks collect dust in no time. You need to maintain this clean, otherwise your laptop will over-heat.
Try to run compressed air in the fan and other laptop vents to clean any dust.
If the fan still does the noise, this mean that it will fail in the near future. If the fan stop turning completely you have to turn off your laptop and leave it off until you replace the fan. Don't use your laptop with no fan, if you do the processor will be permanently damaged.
It seems that your computer is not seeing your hard drive. This could either be because of bios settings or more likely because the hard drive has failed. If the unit is under warranty, call Toshiba support and describe the issue to them. If not, places like Best Buy can determine for sure the cause of the issue.
Ok, well if your machine shows the manufacturer logo (Compaq) and then goes to the blinking light there is usual and issue with either the hard drive (hardware) or the installed operating system (software).
If the cursor is blinking before the logo this is usually an bad component (most likely ram or motherboard) causing the machine not to turn on correctly.
All of these issues need professional help, if not under warranty I would bring this to my local shop to be looked at.
Take a look at this post that deals with a HP nx6110 laptop with random freeze ups.
If the described symptoms also happen on your laptop. If you do
experience random freezeups or slow DVD you're facing the same FSB chip
problem. All peripherals, USB ports included, are connected on the Front
Side Bus. Poor soldering causes intermittent contact which in turn
results in hanging, slow, or totally non bootable (stuck at HP logo)
laptop. Hope this helps.
Could be a number of issues, incl unseated processor or a faulty hard drive. First off I would remove mains & battery, remove covers from underneath and reseat any memory or processors you can find - by reseat I mean just take out and put back.If this fails, I would look to price up a new hard drive before condemning the machine.