Hi my name isXXXXX would like to assist you with your question. I am an expert here on JustAnswer.com in the computer field.
How are you doing today?
Since it is boot up that is a great sign!
I have seen this exact same issue on another ZX series Gateway. The issue turned out to be a faulty hard drive.
However there are some things I want you to try.
Go ahead and disconnect the power cord on the back of the Gateway. Leave the power cord removed for 5 minutes
After 5 minutes plug the power cord back in. Make sure there are no CD's in the drive, Memory cards from cameras, external hard drives or anything USB plugged in (besides the keyboard/mouse)
Try to turn it on and see what happens.
If that fails It would be hard drive related. If that's the case and you do not have much experience with repairing computers I recommend taking it to a local shop and have them do the replacement. Below is a video that shows the disassembly process on that model about 3 minutes into the video you can see the Western Digital drive. If you do take it apart, you can confirm the drive is not reading or causing it to freeze by disconnecting the power connector from the drive. If it is a drive issue it will give you a black screen that says no bootable device
If you have any questions or need any further help i'll be here to help in any way I can
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Also if you need any computer help in the future, you can return to this chat anytime day or night (I am online from 9am est until at least 11pm est every day of the week)
Thanks again for all you patience