Acer aspire 8935g flickering screen on startup..even i see flickering when i go in bios setup...dos mode is flickering... kindly help... Thanks.

This is not a software problem. This is an hardware one. You have to replace the LCD inverter or to repair the existing one. The most common problem in the inverters is the age of capacitors. Im most of the cases if you replace the capacitors the problem is solved. This is working for any kind of LCD monitors and LCD television set. If you are a handy man you can fix it yourself by consulting the internet to see how it looks the inverter and where can be localized, how it looks a capacitor and where you can buy it, etc. If not a handyman try to ask a tehnician for help... Good luck!