Launch Photoshop and initiate a new document (use Ctrl/Cmd + N or navigate to File > New). Design a square canvas with dimensions of 256×256 pixels. 
Introduce a new layer (accessible via Ctrl/Cmd + Shift + N or Layer > New Layer). Name this layer “panel-base” to maintain a structured workflow. Utilize the Pen Tool (P) to sketch an oblique rectangular form. Alternatively, employ the Rectangular Marquee Tool (M) followed by Free Transform (Ctrl/Cmd + T) to modify the perspective and angle as desired. Visual aids such as the gray border Photoshop automatically applies to shapes are optional, though they can be toggled on or off with Ctrl/Cmd + H. 
This border serves a functional purpose but may obstruct a clear view of the shape. To toggle the border visibility, press Ctrl/Cmd + H. 
Proceed by double-clicking on the “panel-base” layer to access the Layer Style dialog. Apply three layer effects to the shape: a Gradient Overlay, a Color Overlay, and a Stroke. Configure the gradient to transition from gray (#d3d1d1) to off-white (#fefcfc). 
The Color Overlay should be a low-opacity black (#000000) with an Opacity set to 8% to slightly darken the shape. 
The Stroke should feature a gradient that transitions from gray (#9a9a9a) to light gray (#d5d4d4). The resulting layer style will impart the desired effects to the flat shape, as demonstrated below. 
Proceed to create a new layer named “panel-gloss” and draw a white shape within it using the Pen Tool (P). Adjust the layer’s Opacity to 67% to allow some of the gradient background to peek through. 
This subtle adjustment enhances the overall appearance. 
Select the Line Tool (U) from the Tools Panel and create a 1px white line at the top edge of the panel. Use Ctrl/Cmd + H to hide the gray border for better visualization. Rename this shape layer as “top-edge-shine”. 
Draw a similar 1px white line at the bottom of the panel, naming this shape layer “bottom-edge-shine”. Set the layer’s Opacity to 20% to create a subtle effect. 
Create a new layer named “panel-thickness” and draw a black shape on the right side of the panel. Apply a Color Overlay and a Gradient Overlay to the left side of the panel, with the gradient transitioning from gray (#d3d3d3) to light gray (#ebe8e8) and an Angle set correctly. 
Set the Color Overlay to black (#000000) with an Opacity of 20%. 
Create a new layer named “shine-basic” and draw a white line along the left edge of the left side of the panel. Reduce the layer’s Opacity to 40%. Duplicate this layer and set the duplicated layer’s Opacity to 100%. 
Add a layer mask to the duplicated layer, select the Gradient Tool (G), and apply a white-to-black gradient with the Reflected Gradient option enabled. Drag the gradient tool onto the layer mask to fade out the duplicated layer. 
Group all relevant layers into a new layer group named “panel” and drag the “panel” layer group above the “Background” layer. Collapse the group for a cleaner workspace. 
Create a new layer named “screen-main” above the “panel” layer group and draw a rectangular shape on top of the panel using the Pen Tool or Rectangle Tool (U), adjusting the perspective with Free Transform. 
Apply a Gradient Overlay to the shape transitioning from light blue (#3b6c9e) to darker blue (#0ad2d9). 
Create a new layer named “bottom-screen-glow” and draw an elliptical white shape at the bottom of the panel using the Ellipse Tool (U). Apply Filter > Blur > Gaussian Blur to soften the shape. 
Select the bottom edge of the screen with the Polygonal Lasso Tool, leaving out about a pixel of the screen for a realistic effect. Switch the glow layer’s Blend Mode to Overlay and reduce its Opacity to about 56%. 
Create a new layer named “inside-edge-shadow” and trace the top and left edges of the screen using the Line Tool (U). Apply a dark blue color overlay to the shape. Duplicate the “inside-edge-shadow” layer and apply a 1px color overlay (#ffffff) to create an inset effect for the inner shadow. 
Create a new layer and select the lower half of the monitor using the Elliptical Marquee Tool. Apply a white-to-transparent linear gradient from top to middle of the selection. Duplicate the layer, rotate it by -30o, and then duplicate it again to create a fan of feathers. Merge the latest three layers and name the merged layer “waves”. Select the “screen-main” layer and use the Magic Wand Tool (W) to select around the screen’s base shape, invert the selection, move the selection down, and delete the excess areas. Reduce the “waves” layer’s Opacity to about 15-20%. Convert the “waves” layer to a Smart Object and switch the Blend Mode to Overlay. 
Add a favorite shape/logo in a new layer above the “waves” layer, reducing the layer’s Opacity to around 81% and applying a Gradient Overlay that transitions from baby blue (#cfedfc) to off-white (#f1f9fd). Duplicate the layer, flip it vertically, and position it to create a reflected version. Add a layer mask to the duplicated layer and apply a black-to-white gradient to fade it out. 
Create a new layer named “sidebar” and draw a white shape on the right side of the screen. Reduce the layer’s Opacity to about 10% to allow the gradient background to show through. Add a 1px border to the left of the sidebar and reduce the layer’s Opacity to about 10%. 
We have dedicated significant attention to the screen and its details, as this area is the most prominent and the small details make a significant difference. Add a gloss to the top left of the screen by creating a new layer named “screen-gloss”, using the Polygonal Lasso Tool to create a selection, and applying a white-to-transparent linear gradient. Set the Blend Mode to Overlay and Opacity to 60%. Duplicate the “screen-gloss” layer, change the Blend Mode to Normal, and Opacity to about 62%. Create a new layer group named “screen” and drag all the layers associated with the screen into this group. Create a new layer and make a tiny black ellipse to represent the center control of the LCD monitor, applying a Stroke and Gradient Overlay. Duplicate this layer twice and position the new buttons on either side of the first button. Merge the three layers and name the merged layer “buttons”. Create a new layer named “buttongloss” and make tiny white circles above the buttons, reducing the layer’s Opacity to about 40%. Create a new group named “Buttons” and drag all the layers
