Try reloading the software. It is an easy task if you have a PC (or Mac) with a USB flash (thumb) drive and connected to the internet. Two clicks to down load two files (1/2 hour). Put drive in XO and boot while holding down all for game keys. Note: this erases everything !!!!!http://wiki.laptop.org/go/No-fail_update
Of course, try the simple check first : power off, remove the battery, wait 30 seconds, reinstall the battery and restart. This resets the EC (electronic controller) and the radio (which stays powered even when the power is off). This has been known to correct odd problems.