PowerPC 5400/180 Macintosh troubles

[LyndonMa]

I purchased several older mac computers. The previous owners wiped out the hard drives before handing them over, and now I have several dead computers. They did not send the original install disks....sigh...
The computers have both CD-rom drives and floppies, although neither are responding. I have a CD copy of OS 8.5 that I want to install......
My question is this: How do I go about resurrecting these computers? Thank you for whatever assistance you can give me! Lyndon from Indiana

[Buzz]

Hi LyndonMa,

Insert your OS8.5 CD into the CD drive, hold down the c key on the keyboard and start the computer. It should boot from the CD. From there you can install the OS onto the hard drive.

The 5400 series shipped with OS 7.5.1 but can run up to OS 9.1.

[LyndonMa]

I inserted the CD into the computer and powered it on, but got no reaction. In fact, I don't seem to get any response from any of the computers (I tried it on 3 different 5400 computers)
Is there something else that I need to do before I try loading the OS?
{Just to make sure, I opened up one of the computers to see if the hard drive had been removed...(These things were built like tanks!!!) The hard drive is still there and hooked up. So is the CD-ROM drive}

[Buzz]

What do you mean by "no reaction?"

Did it chime? Did the screen come up?

[LyndonMa]

That's right.....I don't get a chime orany sound of the cd-rom spinning. The screen does not come on. and the only hint of activity is the faint noise of the4 power supply fan as it starts....

[Buzz]

You'll need to look into power issues then LyndonMa. if the power supply and logic board are in good order you'll get a chime or noise indicating there is either a RAM or hard drive issue or that they are working properly. If when you power up the Mac there's nothing at all there is either a power issue or a logic board issue. Take the macs to your nearest authorized Apple service center.

[LyndonMa]

So, when they wiped out the hard drives, they damaged the logic boards? I am seeing the same problem with all the systems that I have tried so far (I have tried 5 systems and they all seem to exhibit the same problem) Are there any other options for me to try?