Computers dead before entering operating system

Once a friend asked me why his computer would not start, after a sudden turn for the restart command. 
Computers are dead / hangs before entering the operating system can cause can vary.The following tips can be tried. Select which correspond to the problems faced, or do it gradually.· Check the cable from the cable into the UPS / Stabilizer, Power cable to the Monitor, Monitor cable to the CPU and the cable coming into the computerEnsure appropriate and fast installation, and electric currents there and pretty.· If there is a CD-ROM / DVD-ROM and can be opened / closed, then chances are there problems in the computer (CPU), ranging from the power cable into the motherboard or the motherboard itself, check the cable installation.· If the two steps above have been checked, and still not turn on, turn off the computer and reset the BIOS on the motherboard. It can be seen in the motherboard manual, and look for BIOS Reset menu. Normally to reset the BIOS can be done on Jumper 1 (JP1). There is a 3 pin, which two of which are associated with a small connector. To reset, just remove and reinstall in the other 2 pins. 1,2,3 For example, the pin 3 and pin 1 and 2 are connected, then to live off the reset and put in pins 2 and 3. Allow about 30 seconds or so and then return to normal. Turn on the computer.· Ika BIOS has been reset and still does not turn, try out the CMOS battery, which is on the motherboard. Let stand about 1 minute, then reassembled and turn on the computerIf the battery is quite long, more than three years, it is better replaced with new ones. Moreover, if the clock on the computer often do not match.· If the processor fan / VGA spinning, but the computer still on, then chances are there's something wrong with the motherboard or the motherboard's BIOS is damaged. Update BIOS may need to be in, but before the update, the computer must be on (enter BIOS) first. To do that, try to unplug the hard drive, CD-ROM, Floppy. Then, remove the computer memory (RAM) and replace it in another slot or use another computer's memory. This may be repeated several times, until there are signs of life ...· If the CPU is visible work, spinning hard drive and CPU LED light is blinking but the monitor does not have the looks, then kumungkinan VGA (Graphics) computer problems. Try replacing them with another VGA or VGA check on another computer (This is if the VGA is not one with the motherboard).Well if after trying all the tips above but still can not, it is better taken to the service fees. So that really know the damage. May be useful
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