It sounds as if it died. You tried the reset I use so try a new CMOS battery since many models will just sit there doing nothing if it's too low. That's under a 5 dollar part and worth the gamble.

After you put in the new CMOS battery, try the reset again and if nothing shows on the screen get repair estimates.

If you didn't backup your files, just have or remove the HDD and put it into some USB case for file retrieval on your new laptop or desktop.