I have an inspiron 15R model N5040. Recently, I start to experience a recurring issue where the LCD screen freezes and then goes white. I move up/down the screen, and the image comes back OK, unfrozen. The problem would reoccur few minutes after,over and over. These are the steps I took so far:
1- Ran diagnostics (using F12 key at boot time) Full diagnostics passed OK,problem still occur during tests
2- Ran Windows 7 in safe mode, problem still shows up
3- Update BIOS from A02 to A05, no change
4- Open laptop to check/reseat LCD connector, no change
5- Validate that problem would also occur when not in Wondows by going in setup mode (F2key at boot time), problem still there.
When I plug a second monitor, problem would still occur on laptop LCD, but never on the external monitor. Any ideas what to look for?
Warranty has expired.
Tx