Help please! I'm stuck in a 3 colored (boot?)screen!

[Caemgen]

Hi there,

This morning, I was using my phone to read my e-mails when suddenly it locked up and I had to turn it off.

Then, when I turned it on again, some weird 3-colored menu popped up (red, green, blue and then white) with some yellow text on it:

RHOD100 32M SS-BC
SPL-0.84-0000
MicroP(LED) 0x0A
MicroP(KEY) 0x04
TURBO HW/TURBO SW

Then some random numbers and below, in the white area a black text: 'Serial'

I can't get it to work again. I tried to Hard Reset it, but the phone won't respond to it... I also tried flashing to a Stock rom (which I already used in the first place - I never even changed anything since I bought the phone, except for installing SPB Mobile Shell 3.5 a few weeks ago)... but nothing.

The PC connects to the phone though. The text 'Serial' changes to 'USB' when I connect a USB-cable and whenever I install a stock rom (I've tried the RUU_Rhodium_S_HTC_NLD_1.88.404.3_Radio_Rhodium_4.4 9.25.17_Signed_Ship) it finishes until it's at 100%. But then nothing happens. It just stays at the 3-colored screen. Rebooting it doesn't change anything, nor does Soft reseting it.

Any ideas?! Thanks in advance!