My problem child, loved-hated, Philips HDRW 720 was suffering from empty TV guide syndrome since one month ago. After I found this lead, I tried the zip code 00000 trick to shock the system back to senses, and the TV guide is working again( my system is straight cable to antenna connection, no cable tuner box, comcast Northern California). When I was desperate, I almost wanted to buy another brand of dvd recorder. Further search of Toshiba, Panny, Pioneer, etc, they all have TV guide download problem, some new machines do not use TV guide no more. And according to one Amazon.com review, the
new Philips dvd recorder with hard drive is even worse then this problem child.
So i am going to keep it, and hopefully all it needs is periodic shock treatment.