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By "fuse" I'm assuming you mean the fuse in the AC lead
There are several possible cases.
If the led on the back of the PSU (if fitted) is not glowing, then assume the PSU has failed. Usual causes of this are some of the capacitors going, resulting in power not being converted to the 12 volts that the system uses. Best way to check is to substitute a known good psu for the one installed and see if that works.
If the psu is known to be good, visually inspect the motherboard for blown or leaking capacitors, they will show as bulging at the top and sometimes with a brown residue.
Check the connections from the psu to the main atx power socket. Make sure they are tight.
Disconnect all peripherals and try to power on with just the fan and 1 stick of ram installed. Sometimes a faulty component will stop power getting to the system
Check the cpu, a dead cpu again can sometimes stop power getting to the board, you can also see if the heatsink is getting warm as it is powered up, if it is not, then the cpu is likely dead. Check also with a multimeter, the voltage from the 12 volt rails ( connectors that fit into the hard drive etc) red to red black to black, if there is no voltage showing, there is no power reaching the rails from the psu.
(on no account try to check the inboard power to the psu, or attempt to dismantle it).
After that, it would seem that the problem lies in a burned out circuit on the motherboard
Hi this happened to me a few weeks ago. I disconnected all other appliances (printer, scanner etc) and tried again-the pc switched on! It seems the power cut had blown my scanner and while connected to my pc prevented it from switching on (to protect the pc I assume?) If that doesn't work, it may be the power supply to your PC was damaged, in which case you'll need to purchase a new one (not too expensive)
PS When you get it working again, invest in a power surge protector, again not too expensive on Ebay etc.
It could be a time-out setting that is on the router or a setting inside the computer. It could also be malware that has gotten in and affected certain settings that mess with the internet. Have you noticed any weird things going on with the computer lately?
Do not just check conductivity as some fans are speed controlled and you may have a sensor problem. see this wikipedia entry explaining various modern speed detection methods: http://en.wikipedia.org/wiki/Computer_fan#Physical_characteristics
well, if the powersupply whent, then everything is gone and you may need another fan. tis' the way of the powersupply. just try gettin g a new fan! now, does the computer start to boot when you try to turn it on with the fan not working? if it does, then that's good. if it doesn't, then try replacing the power switches in the case(or checking them first at least). hope that helps!
I would turn the computer off at night, but try to restart the computer. the computer can get stuck in a suspended state of "hibernation" and due to a program error or a corrupt file it can get stalled this way ( just like when your computer freezes)