Horizontal white bars whenever I start up.

On Monday, I moved my desktop to my mates' house so we could game together. It was fine.

On Tuesday, I moved my desktop back home. I plugged it bak into my screen and turned it on. The first few start-up attempts, my screen just said 'No Signal,' which made me think that I'd forgotten to connect something in particular. However, it began the start-up process on the fourth or fifth attempt. But instead of the regular start-up, I had this.



And then that would repeat twice or thrice more. Eventually it took me to the start-up repair screen. I've used a system restore and I've reset my PC with files kept.

Since then all I've gotten is 'No Signal.'

Any ideas what I've done?

Doctor9fan said:

Check that the graphics card is firmly seated.

If I try to move it slightly upwards and downwards, should it wobble at all?