Problem with HD4870

[mrh2019]

I’m having a problem, trying to install one of my new HD4870 card, and I’m having driver problems.
Un-installed the Nvidia drivers ok and driver cleaned then as well.
PC boots ok with ATI card I can go into in to safe mode OK and can use the Vista ATI driver OK but as soon as I install the ATI latest driver (hotfix) the pc boots ok, have the windows vista knightrider screen (you know the one), but as soon as it goes into Vista proper it switches the monitor off. Have tried uninstalling and re-installing the drivers have even tried installing the drivers the drivers that came with the card, but nothing help.
Anyone got any ideas? don’t really want to re-format and start again.
Thanks in-advance.

 

[mrh2019]

I have formatted and tried the 8.6 driver and the 8.6 hotfix to no avail.

This doesn't look very good sorry for the pun..

 

[mrh2019]

different monitor? long shot bios defaults and or update??? again you'll need a diff monitor for that to:/

Everything works fine until you install the ati drivers..

 

[mrh2019]

well before the PC loads tot eh desktop it uses a low resolution and when loading into it scales to your chosen resolution... your monitor might be goosed in some way... its worth a try... ok just read your edit...

If you disable the ati driver in devce manager and re-boot the pc works fine in 1920-1200

 

[mrh2019]

Right then,, have just tried using the VGA connection and it works ok, so why not on DVI??

 

[mrh2019]

frequency maybe?! not really sure to be honest sounds really odd...

This is well strange,, have tried lowering the refresh, makes no difference, the monitor model number is correct in the ccc monitor properties screen

 

[mrh2019]

Have just tried my other pc which has a HD2600XT in it, and guess what!!!!

That to dosen't work with the DVI cable but does work fine with VGA.

Might try a different DVI cable, the one i'm using came with the Dell 2405FPW

 

[mrh2019]

Have a bad feeling it could be the monitor causing the problems, there are a lot of post's on other forums regarding ths model off dell and ati card using dvi and this fault and its going back a couple of years..