My refurbished Acer Aspire One netbook worked fine for a few weeks. Now when i try to use it I get the following message: Check cable connection..! PXE-MOF: Exiting Intel PXE ROM. No bootable device - insert boot disk and press any key There is no problem with power. I don't have a cable connection since it is a portable netbook. I have attached a portable drive and tried reinstalling the Acer recovery disks but it does not make any difference. Any ideas? Thanks.