Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I presume that what you have is an Asus Transformer -type laptop/tablet.
If it just won't do anything, the operating system is in bad shape.
Try booting up into the Safe Mode selection screen - if possible, and it may not be possible or make any difference - by pressing F8 key repeatedly while booting up (with the keyboard attached first, of course!)
That screen has selections lower down that can repair an operating system problem.
( If you are getting the 'Locked' login rather than the 'Initial Login' screen, then you may have a suspended session that has gone bad, and it may need to be dumped/discarded. )
If worst comes to worst, you may need to have Windows reinstalled on the Asus device.
How new or old is this Asus device?
If within 1 year of purchase, the failure may be covered by warranty - if this is possible, let me know and I will advise you further.
The blue, dark, blue, dark alternation is probably a defective bootup or initialization attempt that fails and causes a renewal of the same effort, thus causing the alternating screens that lead nowhere.