Toshiba Portege 4005 User Guide - Page 204

204 If Something Goes Wrong Resolving a hardware conflict The computer displays the Non-system disk or disk error message. If you're starting the computer from the hard disk, make sure there's no diskette in the optional USB diskette drive, if it is connected. If you're starting the computer from a diskette, the diskette in the drive doesn't have the files necessary to start the computer. Replace it with a bootable diskette. The drive can't read a diskette. Try another diskette. If you can access the second diskette, the first diskette (not the diskette drive) is probably causing the problem. Run ScanDisk on the faulty diskette. Unplug the optional diskette drive cable and plug it back in to the USB port to make sure the connection between the optional diskette drive cable and the USB port is secure. Modem problems The modem dials the line but doesn't connect, or cannot maintain the connection. You may be connected to a noisy telephone line. To check this, connect an ordinary telephone to the telephone line and try placing a phone call. If you hear an unusual amount of noise or static, try connecting the modem to a different telephone line or connecting at a later time. There may be an incorrect setting in the communications software. Refer to the communications software documentation to customize the modem settings. The modem won't receive or transmit properly. Make sure the RJ11 cable (the one that goes from the modem to the telephone line) is firmly connected to the modem's RJ11 jack and the telephone line socket.