laptop won't turn on. can somebody help me diagnose the problem? fans just spinning. no video

Can you say model of laptop, platform of mainboard and discribe problem?

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Model is HP G60. Mainboard is Wistron Warrior2. Turns on but does not show video.

If laptop turned on, but doesn't show video, you'll need check:
1. upgrade BIOS via programmer
2. plug in debug card and check POST-codes
3. check RAM modules
4. check RTC-battery voltage

Can you say more information about laptop's history?
what did you do before laptop has broken?

Did you do any diagnostic? Describe all your operations...

Don't have a BIOS programmer nor debug card. I changed RAM modules with known working ones and still same issue. The RTC-battery is good @ 3.25 V. I recently replaced the screen because the backlight was bad.

Do you have video on external output: VGA(D-Sub), HDMI?

P.S.:
without toolkit for repair you won't fix issues
you'll need to go to laptop's repair service

No video on external outputs either.