Using a new Dell Precision M2800 which has been installed with the users software that works without issue on other Dell machines this problem happens.
On POST you have to enter the BIOS and enable the network card. Once done you can boot into windows 7 fine. The network card is in the devices manager and all is OK.
If you restart the machine or put it to sleep, once back into Window the network card is no longer on. It does not appear in device manger and the only way to enable it is to go into the BIOS and boot up again.
I've booted into safe mode and this doesn't happen which makes me think its a program or service.
Any ideas how I may troubleshoot this.
As I said, on the old laptop, a different model Dell, the software installed is the same as this and there isn't a problem.
I've updated the BIOS and tried disabling the services used by installed software.