fix a computer that turns on but doesnt display

[Nick8375]

My computer turns on but does not display anything what do I do? Like when I turn it on this fan blows loud then goes quiet otherwise im not sure

 

[COLGeek]

Go through this guide for help:

http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

If this doesn't help you resolve the issue, come back for more assistance.

Good luck!

 

[Nick8375]

Also it is a HP Pavilian a1730n

 

[hang-the-9]

That other guide is more for new systems, there are lots of steps there that would not really apply for an existing system that went down. Only a few issues that cause the fan to start up but nothing else happen (no beeps or anything). Bad motherboard or bad power supply probably cause 95% of this.

Check the motherboard for issues, most often it's bad capacitors, they should all be shiny and flat, if they are puffy or leaking gunk, replace the mobo. If the motherboard looks good, you can try a replacement power supply.

An outside chance that resetting the BIOS may fix this, pull the CMOS battery for about 15 seconds and try to turn it on again.