Hi ur problem maybe from ram or power supply or graphic card so try to replace them and check it another solution : try to update ur graphic card with the latest driver test these and contact me any time :)
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you need to check the power options on you computer, your computer might be set to be off at a certain time.
- check as well the power management software of your computer. change the settings for your computer not to turn off.
try to change the source, that should solve the problem. But before try reset CMOS. (if you don`t know how to do it by jumper simple remove the battery from the mainboard for 5 minutes and then plug it back on..and after that turn on your computer and press F1 for default settings)
If the computer shuts down with no warning then it could be your power supply is faulty, which explains it not turning on sometimes. Just check the back of the PC to make sure it is plugged in properly (TURN OFF ALL POWER TO THE PC BEFORE CHECKING). if this does not help, get it looked at by your local qualified computer technician if you don't know how to replace a power supply. Also, a connection to the motherboard to the Power button may have a fault somewhere, which also means take it in for a look if you don't know what to do. If it does give you warning with 'Windows is shutting down' it can be the following things. 1- Your power button on the PC is sticky and movement causes the computer to think you have pressed it and so it shuts down, which can also explain why it wont turn on all the time. Just use some household grease cutter and spray it on the outside of the button, turn off the power supply to th computer and press it in and out a few times to get it back to working order 2- A Virus is shutting your computer down on you, but this does not fully explain why it won't turn on but this could be an effect of the virus so use a virus checker to see if this is the case 3- Your computer system is getting too hot and usually a computer has setting which shuts it down before permanent damage happens. Check your PC fans to make sure they are running and feel around where your computer sits to see if its warm or hot and replace the fans or put your PC in a cooler environment
No sync means no video signal to the monitor. The rest sounds like a corrupted OS. This could be from a number of reasons, including a virus. If you have NORTON or MacAfee, Your open to a lot of attacks. Get AVG free, and use Mozilla instead of IE.
The reason the fans come on full speed is the MB senses a high temp on the CPU, until the bios fan control takes over after POST. This is normal on most systems.