I think you mean D725, not D735. I don't think that there is an eMachine D735 model.
The D725 series is a laptop.
Unfortunately, there is no easy solution.
You will need to open the laptop, if you know how to do the reset.
First disconnect your machine from power; this is an important step (otherwise the next step won't work); then open the laptop.
Be very careful not to cause damage with static electricity from your body.
After you open it, remove the CMOS battery for 20 to 30 minutes.
That will make the motherboard forget all the CMOS settings.
Reinstall the battery and try to boot-up.
There used to be a software utility toolkit to reset the BIOS password, but it has now disappeared from the Internet because it could easily be used for illegal purposes.
I hope this helps a little bit.
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