Another problem with Compaq Presario R3000Z

[TopPine]

Hello, everyone:
I have Compaq Presario R3000Z almost two years. It's been working very well till last month. All of a sudden, it stopped rebooting when I reinstalled OS. After I turn it on, only cooling fans and DVD-ROM work but nothing else even power indicator.
Any suggestions?
Many thanks.
Yongping

 

[Que]

After I turn it on, only cooling fans and DVD-ROM work but nothing else even power indicator.

That's odd, is this the same with the battery removed and working with the power supply only?
If so:
Nothing at all on screen?
If so, it looks to me that you must check the internals: remove the second memory stick, if you have 2, the one easy accessable. Try to boot up. Clean out the fan area, (can't harm after 2 years) check the cpu for burn marks.