I have Lenovo N500 42334CG that provided lovely HDMI ouput when connected via HDMI cable to LCD t.v. Today I tried to connect again but alas there's no video / audio on T.V. from the Lenovo HDMI, tried to switch HDMI sockets on my TV with no success. BIOS reported by Lenovo diganostics is 6GET19ww (for non-HDMI), Could it be that an inappropriated BIOS update was installed on my Lenovo such that doesn't support the HDMI output port anymore ?
This Bios version 1.10 (6GET19WW) package is only for non-HDMI Platform on Lenovo N500 or Lenovo G530 (Type: 4446). If other G530 system (Type: 4151) flash this bios package by accident, it will cause "No HDMI Function" side-effect. But, you can flash back to previous Bios version by downloading the according Bios packages from Lenovo website.
Customers who have systems with HDMI should use BIOS 1.09 (6GET19WW)