Do or did you ever have a serial mouse on the PC? If so it may be using COM1, which will effect IRQ4. If no mouse there may be a driver in there for a old serial mouse causing a problem.<br><br>Have you tried uninstalling the COM Ports and reinstalling them?<br><br>Is the printer attached to a...
Update.<br>Thanks for all your suggestions. Tried everything you suggested. When i receive the "invalid command com" message i can hit enter 3 times, it then gives me an A: prompt. The boot disk does load up the diagnostic tools but not the CDROM drivers. <br><br>Aside from this the...
Hey people,<br>Everytime i boot my PC up with a boot disk so that i can fdisk and format my HD i get an "invalid command com" message and i cant get to a DOS prompt. Have tried different boot disks created from different machines with no luck. Any help would be greatly appreciated.
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