- June 20, 2011 at 11:17 am #29171
Hi Everyone,This is a strange and baffling problem. Iâ€™m not a complete novice and spent a lot time and tried many different things trying to solve it on my own, but nothing worked. Please bear with me as Iâ€™ll do my best to describe the situation.Some time ago, I decided to build a budget pc to serve mainly as an HTPC of sorts. The idea was to spend the bare minimum initially and then upgrade the system as I go along. I therefore opted for a mobo that has (what I thought was) decent onboard graphics and HDMI output (ASUS M4A78LT-M) so that I could hook it up directly to my TV (Toshiba Regsa). As I mostly work on my laptop, I donâ€™t have a computer screen (and no real reason to buy one). Here are the systemâ€™s specs:Mobo: ASUS M4A78LT-MProcessor: AMD Athlon II X2 250 3.0GhzCPU cooler: StockRAM: 4GB (2 X Crucial DDR3 PC3-10600; 3.25GB usable due to 32 bit OS)HDD: Western Digital Caviar 500GBODD: Pioneer DVR-A18LBKOS: Windows 7 Professional (32bit, SP1)From the start the video outputs have been giving me a headache. After putting the system together and working with the VGA connection, I was trying to install Windows XP on the machine, but the screen kept going blank after POST and giving the onscreen message â€œunsupported video formatâ€. I almost gave up thinking it was a compatibility issue with my TV or that the modo was DOA, but then I tried to install Windows 7 and suddenly everything worked fine. After installing the OS, I updated the bios to the latest version (0802), as well as the graphics drivers for the chipset (760G) and the HDMI connection came to life. So far so good. After that the system worked without a hitch for about 5 months. But then two weeks ago the TV screen suddenly went blue, indicating there was no signal from the HDMI port. I went back to the VGA connection and that way the machine works fine (except for the severely degraded graphics of course). Iâ€™ve tried everything I could think of to bring the HDMI back to life, including: (1) changing the HDMI cable to a new one(2) troubleshooting with Windows 7 diagnostic tools (no hardware problems found)(3) checking all the bios settings thoroughly, and thenâ€¦(4) flashing to the latest bios again (ver. 0802, which was already installed)(5) re-installing the latest driver for the chipset (760G)(6) clearing the CMOS(7) re-installing the ATI Catalyst software (which is supposed to control the graphics)(-) connecting the system just with VGA cable (ok, but degraded resolution), then just with the HDMI cable (nothing at all), then with both (VGA ok, HDMI nothing).(9) jacking up the resolution from 1280X1024 to 1600X1200 in the hope the system will switch for VGA to HDMI mode (VGA goes blank as expected, but HDMI channel remains blue/unresponsive)(10) writing to ASUS support (and getting the most inane and annoying response â€“ not worth repeating here.)June 23, 2011 at 10:02 pm #33318
Just let me think about this for a day..I am also sending it to a friend for a second opinion.. he builds computers and has run into problems similar to this.June 27, 2011 at 12:27 am #33319
Here is what my friend said:Hey Mitz I have come across this a couple of times so farProblem is that as far as I can see is that windows 7 has done a video update to one of microsofts driversWhen this happens video goes nutsMy solution would be to uninstall the drivers and only install the asus drivers for it NEVER INSTALL A MICROSOFT DRIVER FOR WIN 7
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