I have a cq60-dx615 laptop. After 1 yr it started freezing, and then wouldn't start at all. When I turn on the computer the battery and power adapter lights come on, but the disk drive light is dim and I don't hear it running. I have plugged in an external monitor and get nothing on the monitor. I have installed a new inverter board, checked the memory card and slots and checked the hard drive. I put the hard drive into another laptop and it started up with a message

If the fan is dead and the old HDD is pure silent the power pack is dead. (battery out)
no OS stated, then post questions, why> , why make it impossible to help>/ let me guess the virus magnet XP? or worse older?
some are vista and w7 fitted... must I GUESS THIS?

dead laptop 101, (generic)
runs ok battery out, BINGO !
BIOS works? that is first not windows EVER, BIOS works.
does it?
you do know BIOS works with CD drive and HDD drive out right>?
if not the power pack is dead, or the mobo regs are dead.
you can pull ram sticks and run them 1 by 1 to see if one is toasted.
there are many modules on all LT MOBO, that can short out.
a tech pulls them. to learn that.. fact. bingo?

what a tech does is strip it down to near nothing here
to get BIOS alive again. if its goes live the fan spins, see?
if BIOS is dead, all PCs made are dead. hopeless.
BIOS does the boot and hand off to HDD< see?
focus like a laser on BIOS....! and win.

you typed the model wrong, so is now 2 times harder to help you.
Compaq Presario CQ60-615DX Notebook PC


HP has support but not software now, (sadly)

https://support.hp.com/us-en/product/compaq-presario-cq60-600-notebook-pc-series/4074237/model/4121161/manuals


its just a filler page, the service guide is NOW MISSING
so i cant spoon feed you the BIOS hot key
but the black screen page here tell it.

F1, F2, F10 and ESC.
If you boot a working PC (no hdd, no cd drive needed)
you will get a text message. from BIOS
telling the above, secret.

every way on earth to get a black screen or silent pc or dead bios is there. (seems so)

http://pcdied.com/black-screen.html