My friend was playing haven with me for a while using Amber client. One day he logged off and closed the client, the next time he tried to open up Amber, nothing happened. The generic Java loading screen showed up, but would then disappear and nothing would ever happen. No error message or anything. He has tried to use the default client, download the default directly, nothing. It simply never opens. We compared Java version and settings with mine which works flawlessly, to no avail.
His specs are the following, but keep in mind he played it before with no problems so i doubt it's system specs.
Windows 7 Ultimate 64-bit,
Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40 GHz
8.00 GB RAM
ATI Mobility Radeon HD 3870 X2
The video card's old and the latest driver for it is 5 years old.
I really don't know what other information i can give. It opens the Java loading screen, screen goes away, nothing happens. No error message, process disappears from Task Manager.