My acer aspire 7739 says no bootable device on start up i have taken the hard drive out and cleaned and vacuumed it It still said no bootable device do I need to replace the hard drive or is there something else I need to do it also has blue screens a lot but it doesn't click its very laggy when it does start. It almost never connects to the internet and freezes and I have to restart it. The laptop is also 8 years old