"Computer wont start it just beeps"に関する回答Find your computer’s user manual or service manual, and find the beep codes section to figure out what the beeps mean.
"250 Mbps from ISP. 686 Mbps Cable modem. Is the modem powerful enough?"に関する回答Yes. If the cable modem can provide greater than or equal to the speed of the internet connection, it will be fine.
"Replaced battery on MBA won't turn on"に関する回答Try making sure the battery cable is plugged in. Also, the SSD should have nothing to do with it. check to see if the battery is faulty.
"No picture says in power save mode"に関する回答try checking the computer and seeing if it iis awake or if the monitor is connected to the right port.