The below debug routine will check the ports of the computer to allow you to know if ports are being detected or not.

Type debug to get to the "-"

Type D40:0

You should get several lines; however, the first line is the only important line, which should read the following:

0040:0000 F8 03 F8 02 E8 03 E8 02 - 78 03 78 02 BC 03

F8 03	F8 02	E8 03	E8 02		78 03	78 02	BC 03
COM1	COM2	COM3	COM4		LPT1	LPT2	LPT3

The above graph shows you what the feed back means as far as port, so if you see F8 03, this would be an indication that COM1 is being detected; if you see 00 00, this is an indication that it is not being detected, which could mean that hardware is bad or that it is disabled in CMOS.

Once you have finished looking at the information, type Q and press enter to get out of Debug.

The below debug routine will clear CMOS, BIOS, Passwords, Settings, Viruses, and other items residing in the CMOS. During this process you may get returned characters which are an indication that the string has gone in, if you by chance get ERROR ensure that you have typed the line in correctly, if not retype. Ensure that you do not skip any lines, that it is ALL typed in correctly to help prevent problems. Before running this Debug routine also ensure that you have read the above disclaimer.

After typing debug you will get "-" which is were you can begin by typing A and pressing enter.

A
MOV AX,0
MOV AX,CX
OUT 70,AL
MOV AX,0
OUT 71,AL
INC CX
CMP CX,100
JB 103
INT 20
Note: Nothing is typed on this line
G By pressing G this will execute the above script, ensure you have read and agree to the above disclaimer.
Q

Then reboot and you will get a Setup Checksum Error. Go into setup, correct all the incorrect values, time, date...