Win xp to the progress bar when the reason for the screen

After booting, to the windows progress bar, suddenly black screen, how can not enter! Can enter safe mode,

The general reason is:

1 You take out the memory to clear it, too much dust.

2 There is a problem with the system, heavy down System.

3 The hard disk has bad sectors.

4 There is too much dust on the motherboard inside the machine, which will cause this fault.

5. If it is a CRT display, the system displays the frequency. Too high.

6, bad network card or sound card.

7, unstable power supply board capacitance.

8, unstable power supply chassis.

9, within the device enclosure with a slight short circuit.